Asides from One Piece and Toriko both having their own respective 3D movies this March 11, it is just recently announced on this year's 14th issue Weekly Shonen Jump that a crossover TV special between One Piece and Toriko will air on Sunday, April 3!
The two main characters of their respective stories, Luffy and Toriko, will share the same stage as they meet in the jungle. Along with Toriko's Terry, One Piece's Chopper, and other characters, the cast will face danger when they are surrounded by creatures.
Not coincidentally, Toriko will premiere in April on Sundays at 9:00 a.m. and One Piece will continue to air on Sundays at 9:30 a.m.
Source: 2channel via Anime News Network, moetron