Plot idea (sort of):

The Expendables are chillin in their bar. Donnie Yen, Tony Jaa, Lee Byung-hun, and Zhang Ziyi pader in like they own the place. They cause a scene and basically call out the Expendables. It turns out they are old affiliates of Jet Li’s character from another team. They are pitted against the Expendables throughout the film. They either remain the antagonists or team up with the Expendables to take out a greater evil (or whatever, use your imagination). Jackie Chan can have a role similar to Arnold’s or Bruce’s, just for the other team. This needs to happen...