Had a quick trip aboard 156471 tonight, which looks the best of the bunch thus far in terms of the new livery. The inside is far more underwhelming, just a bit of a clean and some new blue padding here and there, but I believe this isn't the finished product internally?
That's correct, none of units in the new livery are the finished product yet. The quartet of DMUs (150275, 156471 and 158752/756) are the closest though, but how close to the finished product they actually are, I don't know. The 319s which are in the new base livery have only had PRM mods so far, with the rather loud Northern Rail interior clashing with the much more subtle Arriva Rail North exterior. The one refreshed unit I have tried so far (158752) wasn't too bad at all, although I'm not going to make my final judgement on the refresh until we're told 'this is the finished refresh'.
I have to agree with you on the livery, the 156 definitely looks the best so far, in my view. The 150 doesn't suit it all unfortunately (the logos look too large to me), but I think the 319s will look good.
With regards to the seats for the new CAF units, as long as they aren't the ironing boards (Option B), I don't really mind whether they're Option A, Option C or "the mix of both" Option D. I voted for Option C myself, good posture and plenty of padding, so obviously I'd prefer those to be chosen but time will tell.