Rumours say that Part I will have Iron Man, Hulk, Thor, Captain America, Black Widow, Hawkeye, Falcon, Star Lord, Gamora, Drax, Rocket Racoon, Groot, Ant-Man, Daredevil, Jessica Jones, Luke Cage, Iron Fist, Black Panther and Doctor Strange will team up in the cliffhanger. Then Captain Marvel and Inhumans will join in Part II for this epic fight against Thanos with his infinity gauntlet. These are rumours they're likely to change due to these films being released 4-5 years away and its very early to discuss.