FO3 should tap the imagination if done right.
I detest slamming a game prior to release. All your comments are based on speculation. Something tells me this is the game of the year for 2008. Easy.
That is only my opinion though. We will not know till it is released.
This should wet your apetite and bring you up to my level on what it is going to be - I see a true Dues Ex (not the lame #2, but #1 - and I've been in this biz for 30 years and can smell a good thing when I see it) type sequel in my opinion -
http://www.anandtech.com/weblog/showpost.aspx?i=486
-S