While many fans were hoping to see Transformers and GI Joe have a cross-over film, that doesn't seem to be happening, at least not yet. However, it looks like GI Joe will be crossing over with other Hasbro properties according to EW. This larger cinematic world will contain Hasbro properties such as Micronauts, ROM, M.A.S.K. and Visionaries, all of which were toy lines and cartoons during the 1980s.
“Paramount and Hasbro have had a longstanding relationship and we’re proud of the success we’ve enjoyed on the Transformers and G.I. Joe franchises,” Paramount Pictures CEO Brad Grey said. “We’re excited to grow our agreement and make even more movies based upon these popular and powerful Hasbro characters and their worlds.”
The plan is to get some top tier creative talent for this expanded universe but there's no news yet on when the first crossover film will happen.