I'm very excited! I was part of the BioShock forums before it really became well-known, so I've seen the first game all the way from the barest of hints to, well, now. And although it's not exactly what I expected, I respect the work that Levine and his team do.
And the more I see of this game the more I want to play it
There's a really interesting hands-on article here
which I found very readable. But although it doesn't spoil anything specifically, it does reveal some stuff about the overall shape of the game that someone wanting to go in blind might prefer to avoid.