Sorry to bump this up to the top, but I thought that this would be worthy of it.
These cars that were shown in DC were placed on the last road show in DC this year, in place of the EU spec models that were there before.
The car is noticeably different in US spec. It seemed quieter, smoother, and the taller 5th gear in the transmission means it is keeping out of 5th at around town speeds for the most part. Once or twice, it did try to hit 5th gear when in auto mode around town (I went on 3 drives), which resulted in shuddering - but then it realized that it needed to shift down, and did so before I intervened. The manual mode is as slick as ever, and the new shift knob falls readily to hand and feels solid through its detents (one of my concerns, because as I understand it, it is just a hall effect switch, nothing more).
The new cluster is the same that we have seen, with the long horizontal fuel gauge and no engine temperature gauge (why, I do not know... I'd like more than a light, but that's what the scangauge is for).
Overall... this is going to be a long and painful wait, but very worth it, once the beast gets here.