I managed to catch a glimpse of the interior while it passed through Waverley. I must admit, they've done an absolutely fantastic job. The standard class seats look fine and roughly equivalent to other HST offerings but I would argue that the first class interior is a clear step above LNER's, for example. The presence of a shop (and a guard's "office") is a great idea and something I always used to think was a good idea when I saw them on the few ex-Hull (I think?) 170s that had the shop areas but were never used.
Absolutely - and rightly so, this is a significant step-change for Scotrail and one which I really hope works, in the long-term. (Incidentally, I was disappointed to see Scotrail twitter posts about this attracting such negativity, already - the perils of social media, I guess)