yeah, that's pretty much all they've revealed. plus some interviews.
I can't say it won't be a huge disappointment though, considering it will be very different from the original Fallout 1+2, which both happen to be my favorite games.
however, Bethesda did a very good job with Morrowind and a good job with Oblivion and I can imagine that such a big open world in the Fallout setting will be pretty cool.