Here is the most recent 2011 3D feature release schedule, as posted on Box Office Mojo here
The Green Hornet (in 3-D)
Sony
1/14/11
Sanctum (3D)
Uni.
2/4/11
Gnomeo and Juliet (in 3-D)
Mira.
2/11/11
Justin Bieber: Never Say Never
Par.
2/11/11
Drive Angry (in 3D)
Sum.
2/25/11
Mars Needs Moms (in 3D)
BV
3/11/11
Rio
Fox
4/15/11
Thor
Par.
5/6/11
Priest (in 3D)
SGem
5/13/11
Pirates of the Caribbean: On Stranger Tides (3D)
BV
5/20/11
Kung Fu Panda 2
P/DW
5/27/11
Green Lantern (in 3D)
WB
6/17/11
Cars 2
BV
6/24/11
Harry Potter and the Deathly Hallows (Part Two in 3D)
WB
7/15/11
Captain America: The First Avenger
Par.
7/22/11
The Smurfs (in 3D)
Sony
8/3/11
The Darkest Hour
Sum.
8/5/11
Spy Kids 4: All the Time in the World (in 3-D)
Wein.
8/19/11
Fright Night (in 3-D)
BV
8/19/11
Final Destination 5
WB
8/26/11
Untitled 3D Shark Thriller
Rela.
9/2/11
Piranha 3DD
W/Dim.
9/16/11
Dolphin Tale 3D
WB
9/23/11
The Three Musketeers (2011)
Sum.
10/14/11
Puss in Boots (working title)
P/DW
11/4/11
Happy Feet 2 in 3D
WB
11/18/11
Arthur Christmas (in 3D)
Sony
11/23/11
Hugo Cabret (in 3D)
Sony
12/9/11
Alvin and the Chipmunks: Chipwrecked
Fox
12/16/11
The Adventures of Tintin: The Secret of the Unicorn (in 3D)
Par.
12/23/11
Journey 2: The Mysterious Island
WB
2011