Oliver Stone's: World Trade Center
http://www.apple.com/trailers/paramount/wtc/large.html
Sure it'll be about as fun as an all-day Schindler's List marathon but I'll still catch it. The trailer seems to give a lot away so I'm guessing it'll be at least an hour of two dudes pinned down while their families and the rest of the city goes apeshit.
Come to think of it, there really isn't much new one can do with a 9/11 movie. Throwing it into adventure territory would probably piss a lot of people off anyway (but holy shit the special effects would be awesome!)