We might as well just assume he'll be playable, because- firstly- everyone else in the image is playable, and secondly- he's already in the game as a team-up disc. The chances increase his odds of being playable when you take in to account the fact that Marvel still has 4 unannounced playable characters from their official playable character board. [ Pic and info about the board ]
I've been thinking this was going to be the approach for some time, as I wrote back on June 6th:
Well, I think this will be a great thing. I want to see some levels where everything is humongous and you have to navigate the world as a tiny hero. Much like the Super Mario Bros. in Giant Land."Well, I thoroughly look forward to more of what is to come in the following months as we get closer to the release date. Especially the Marvel: Age of Ultron related stuff, which the Disney Infinity team has been ultra secretive of. We have gotten a lot of information on everything else except the Marvel group for Disney Infinity 3.0.I'm actually wondering if they'll be having a bunch of Ant-Man themed stuff that just hasn't been announced yet, and maybe they're waiting for the movie to be released first. They already have his character modeled and usable as a team up..."
Disney INfinity 3.0 releases August 30th.
Source [ Disney INfinity Official Twitter ]