This is a really old build, like, really old.
This is way back when Microsoft first announced plans to make a new Windows software specifically for ARM processors and tablets.
The entire system, from what can be seen during live shows and cons, is way different, if not totally unrecognizable now.
The final release is scheduled sometime in late 2012 (apparently), so there's still a long way to go before we can say that this "looks like 7".