For me it will be....
Star Trek Into Darkness: Average story but great visuals; even though parts of the movie made me cringe seeing Star Trek in3D is one of those items on my checklist so this is a must buy.
Man of Steel: In my opinion a great re-imagining of the character for the post 9/11 world; I only saw the 2D version theatrically so I'm curious to see how the 3D plays at home
Pacific Rim: Never saw this at the theaters (more because of lack of free time than anything else) but the positive word of mouth around these parts has made me curious.
I'm torn on Iron Man 3; I've been a huge Iron Man fan since childhood; loved the first movie, liked the second one, thought Avengers was great but was incredibly disappointed and downright angry and what a poor experience watching Iron Man 3 was. My expectations were really high going in so part of me wants to give it another chance but certain creative decisions (how the Mandarin was presented, what Stark ends up doing with his armors and ARC reactor, and the whole finale) really made me hate the movie. Might wait for a sale or other price drop.
World War Z is another one of those movies that wasn't on my radar but it got some good writeups so I may pick it up if nothing else is available and I'm looking for another 3D title.