The seats themselves are similar to majority of those on the Electrostar units temporarily assigned to the route.
But surely you would think that the seats could be of a slighty more comfortable design? There are plenty of more comfortable seats out there on the market.
The 377/2s, 377/5s and 387/1s are all on temporary loan so they have no significance for the planned class 319 replacements scaled for future passenger growth.
Try telling that to the average passenger though. For the past few years they have been travelling on trains that are better than the ones that are replacing them.
They
are a compromise between metro and outer suburban trains:
1) they have toilets fitted (outer suburban requirement for longer journey times)
2) they are 100mph rather than 75mph trains (outer suburban requirement for integrating with MML inter-city and BML express services)
3) they have wide entrance doors (for minimal dwell times both in the core and main stations on the MML & BML)
4) They have full width gangways and good standing room (for very high passenger density parts of both outer suburban, metro and core sections)
The issue is that the core will in a few years be saturated with trains each as long as their routes will allow. ETCS signalling aided with ATO will maximise the frequency at 24tph so each train has been designed for the best balance between total peak capacity (over 1700 sitting and standing) yet with adequate seating for off-peak passengers.
I can understand the removal of seats as helping capacity issues, but what difference will the addition of tables make? People do not stand in the gap between transverse seats, there is nowhere near enough room.
The trains are more powerful and lighter than the Electrostars on the BML and will all be 12-car in the peak. Their acceleration should be optimal for the route, and certainly faster than the 319s they are replacing so timetable recovery should be better than previously.
I have no choice but to admit my mistake here, I was wrong. 
I could have a'Grumpy, Haywards Heath'-writing-in-the-Metro-style rant here about how the constant delays will mean that the increased acceleration will make no difference to the journey time overall. I think I must have just been in a bad mood when I wrote this.
Although one thing I will say, is that I don't think journey times matter all that much to BML passengers, especially as the times at the moment are pretty good anyway.
Once again I remind you that the trains will be in use for over 30 years, so there is little point in designing the route and its services for current loadings. All predictions are expecting a continuation in the current growth trends.
Again, I don't see how tables will affect the loading capacity. If we are going to approach the topic of future loadings in this way then we might as well remove all seats from London to Brighton trains.
Have a happy new year.
And to you!