Zombieland 2 is quite likely to be in 3D! Well' that's what screenwriters Paul Wernick, Rhett Reese told to MTV:
ZOMBIELAND 2 in 3D
We want you to be looking down at your popcorn to make sure there isn’t blood on it. There will be a lot of fluids flying!"
Besides writing the script Zombieland for 3D they also hint at Tallahassee, Woody Harrelson's character, getting involved in some romantic adventure, they didn't tell yet though he's going to meet a healthy woman or a female zombie...