I would buy it if it came with a media center type of software that allows me to control my TV. This way, it can act like a coffee table, foot-rest, remote control, TiVo, as well as something to play arround with when guests arrive, etc.
I know this is sort of like mostly using it as a touchscreen controller for the TV, but if I can make it a dual screen computer with both the table and the TV as screens "stacked" where I can move the internet from the table to the TV and vice versa with videos, then I think it would be cool.
It would also be good with games because you should be able to program a virtual controller of any type and play with your friends in front of the TV. Yes, in addition to the lame piano demo.
It's got to be tough like the real Surface where you can stand on it so if we wanted to, we can do some DDR type of games... Then maybe I will buy 2.