Well, it's all in the eye of the beholder of course. The contours look very similar to the current Mira and Starla, and in my eyes they are much more defined than the contoured SE. The thing with the US built ones are in the details, you really notice it when holding/playing one. After playing the US ones the SEs feels cheaper. I mean, don't get me wrong, I love the SEs (I have two myself). And of course the would feel cheaper since they are about 1/4-1/3 of the price. It's just that I feel that there is quite a gap, and if these are closer to the US models they will be very nice guitars indeed.
Personally I couldn't care less were a guitar is built, but as it is now, the US factory produces some really nice guitars. If they can rub off some of that magic onto these, I could see myself getting one in the future. A single cut model of these would be killer!
So to summarize: The SEs are killer guitars for the money, they really are. But there is quite a gap to the US ones, and the S2 models will probably be great guitars for the money too.
Twinfan: Just read on the PRS site that the bodies are one piece. Didn't say anything about how they make the necks though...