Okay, I know it's late, but here's the tea on the Class 895. From memory.
General details
The train's being built by Hitachi and Alstom, as you know. The external design, the mechanics, all of that is Hitachi, based off the Zefiro. The internal systems and bits and things is all Alstom. That said, they are working together nicely. The renders we have (eg on Wikipedia) are old - the design's been updated slightly and we've got new renders, as seen in the attached images. As mentioned, it'll be an 8 car train. Currently HAH-S is working with the West Coast Partnership (Avanti) on things like branding (I'm talking about branding the train, not things like the livery) - but with GBR coming in, we'll have to wait and see.
Externally
Hitachi's been doing this, so we didn't really learn much about it from TGG. Despite being built on the Zefiro platform, they don't really look like the others. They're just about on the final door design and PTI user research has been going on for a while. The doors will have an extendable step for level(ish) boarding (well, maybe more 'not a huge step boarding'), and they've tested the different platform heights. The doors will have a display under the window, within that whole big window cutout area. Also, the gangways are currently supposed to be fully covered, for aerodynamics. If that's important to you. Finally, the trains will be delivered in off-white with grey doors, then livery applied (that is the current plan).
Internally
Big things! It's looking very good to me, and they seem to have worked hard. Generally - seat layout isn't anything crazy, the mockup was quite spacious (I was in a HST before going to the mockup and didn't feel cramped in comparison), and the light temperature has been thought about. Just a note: the mockup is grey and drab. That's because they're focusing on getting feedback on the form of the interior, not the aesthetics. It will not look grey and drab in service.
Seats: The seats on display were
not the seats that will be on the train, more just representative of the layout using 'typical seats you might find on a high speed train'. They looked like the seats from a GA FLIRT to me. The actual seat design was not finished, but looked good, and looked like they had given it a lot of thought, thinking about basically whatever they could. Comfort was also seemingly stressed as very important in a conversation I had with someone from the team. Also, things like tables are a good size, with very in depth thought about every aspect of them (for example, the cupholder depth was fine tuned). There were reservation displays that looked like e-ink, which is very smart and should've been done earlier. They didn't seem to be the same as the IET traffic light style reservations. They also gave consideration to disabled passengers - the disabled area was actually moved so they could get a good window view, and there's no overhead luggage storage above the disabled spaces so any assistance doesn't bump their head helping the person. Overall, there was good headroom, good legroom (I'm only 5'8 though...) and generally, seemed like it would be a nice ride. With that, I'm hopeful, but didn't sit on the final product so I don't really know.
Lighting and ambiance: It'll have adjustable RGB lighting, so things like brightness, colour, and colour temperature can be changed in sections. Generally this is expected to stay the same for whole carriages though. To me, the light temperature was great, and the saloon felt bright and airy - but not clinical.
Bathrooms and vestibules: There are a lot of PIS screens on the train. There are displays in the normal places, but also next to the doors, and even a small screen embedded in the bathroom mirror. The bathroom wasn't interesting other than that. The vestibules seemed spacious and well sized, and there's a slight (and I mean very slight) ramp down upon exiting. I did film a video.
Bike storage: The bike storage seemed well thought out, with feedback from cyclists brought in. They had reservation screens for the bikes too - nice. Don't really know what else to say.
Crew areas and cafe: There is an onboard shop, which was buffet style, and didn't seem too different. It wasn't cramped, but it wasn't exactly super roomy walking past the counter. The First Class/Standard Premium/whatever food prep area isn't really consumer-facing, so I don't think people will care much. Your expected equipment, really. Nice considerations made for staff, like a staff storage cupboard, but I don't know if this is unique or just the done thing.
Misc: There was a lot of PIS, but the UI seemed very 'mockup' and not done, and this is true - that'll come later, as expected. Still, it'll have things like key areas on the train pointed out (like toilets and the shop, etc), the destination, next stop, weather, time, and current speed. The overhead displays were quite narrow to me (didn't go the full width of the carriage!) but I know how much ergonomics and sighting research and data goes into the design and placement of this, so I'm not going to question it, really. From layout diagrams, it seems like the toilet provision is quite good. There's also dedicated buggy storage, which is lovely, and they seemed quite proud of this. Luggage storage was fine, just regular racks, but I feel like they could've had more, or a newer system (like the NFC bag storage seen on the new NightJets and 222 refurb). First class is currently intended to get a trolley service, and standard has the cafe car. Also, it's not a walkthrough train.
All in all, it's important to remember how early into the process we are. I thought it looked great when I went to visit, and I was ready to be... not thrilled. Instead, I was very pleasantly surprised. Things like the cab and operational bits weren't shown here, but I'm sure they're working on it. Lots of things are still being developed - to be honest this was user testing masquerading as 'come check out the 895s!' and I don't blame them for it. Genuinely though, I really
really admire the team - you can tell they're all passionate about it and working hard to create something great. They know their stuff and it shows, and they're open to feedback to make things better, but also have conviction and good reasons for when they've done something right. They're working against a lot - funding, suppliers and what they're willing/able to do, what Hitachi want, what Alstom want(!), and what have you. Despite this, they already have something that I think could be a winner. With the backdrop of HS2 and how poorly it's been going as a project, alongside other high speed systems globally (the TGV-M interior is just stunning), and the massive uncertainty with GBR coming in (designing with a client - WCP - that will no longer exist when it's finished!), they've done a brilliant job and I don't see any signs of them slowing down. We are so early into this process, and a lot will change before the last iteration and final design is rolled out. Everything I've said has been what I observed at this point, and I look forward to riding the finished thing one day. Good luck to HAH-S and full speed ahead.