The official Disney Infinity Twitter has tweeted an image of the Marvel heroes standing in a circle, with a small figure in Hulk's hand,
with a big header saying: "Something Big is coming to Disney Infinity".
With Ant-Man releasing this weekend, it's safe to assume it's him. We've already had the team-up power disk with Ant-Man. News has been pretty dry at the moment, especially for Marvel fans. I doubt that there is a playset, because really I could imagine two characters that would be playable, Ant-Man included. I personally wouldn't want an Ant-Man playset especially because the film's reviews haven't been as spectacular.
Anyway here is the link to the tweet
Thanks for reading true believers!