My guesses so don't take them as money on the table bets.
Avengers : Probably spider-man 3 numbers.
TDKR: I really want to say higher then a billion, but I can't really see it right now, maybe when I actually start to hear people I know in person get siked for it I'll start to belive it, but right now I can see a little over 900 mil WW.
ASM: Ahh, good ol' Spidey. This one is going to be a wild card for me. I can honestly picture this movie coming close to TDKR and everybody on SHH going "what the flying eff?" because the Asian market will gobble the film up, and a lot of my friends who watched the trailer agreed it looks good. I can picture on par with Avengers.
The Hobbit: I'll have to see as I get closer to release date, but it COULD hit a bil.
I have a feeling we could have a bil or two this year, but I can't decide which.
Something tells me TDKR, ASM, and Avengers will all have similar numbers.