G.I. Joe 2 has, according to Deadline, announced a release date of June 29th, 2012. Though the film is referred to in their article as being titled G.I. Joe: Retaliation, ComingSoon.net has confirmed that no official title has yet been chosen.
The film, to be directed by John Chu (Step Up 3D, Never Say Never), will continue the toy-inspired world depicted in 2009's G.I. Joe: The Rise of Cobra with a primarily new cast (except for the returning Channing Tatum as Duke, Ray Park as Snake Eyes and, likely, Byung Hun-lee as Stormshadow). Newcomers include Dwayne Johnson as Roadblock, Elodie Yung as Jinx, DJ Cotrona as Flint, Adrianne Palicki as Lady Jaye, RZA as The Blind Master, Ray Stevenson as Firefly and Joseph Mazzello as Mouse.
The June 29th date was originally being held for another Paramount property, the studio's Star Trek sequel. Though J.J. Abrams will likely direct, the project will now see a release at some point further in the future, likely as either a December 2012 release or as a summer 2013 blockbuster.