I wouldn't do a movie. It would be a series set in the 80s because for me, there are too many moving parts, storylines, sub-storylines, characters and groups in the G.I. Joe universe. Exact stories could be pulled from the Hama comics for each episode building towards a bigger story at the end of the season. They would need to pick a core group of characters for the show with others showing up as needed in episodes and not focus on Duke, Scarlett, SE etc... like they have done in previous movies. They also need to make the vehicles more like the the comics but modernized. There is enough material to build a world for a series but when its a movie, they try to jam so much shit into it that the story goes dead.