Well, thanks to the end of Avengers Assemble #3 (as released yesterday), looks like we have a better idea of what Bendis’ post-Avengers project is going to be. Spoilers for the comic and the movie, everyone (copious white space left to protect those avoiding such things).
In time to coincide with the movie, AA #3 resurrected this guy:
Thanos was last seen in the Thanos Imperative mini-series that ended Dan Abnett and Andy Lanning’s rein as Marvel’s Comic Czars, being trapped in the Cancerverse with Nova and Star-Lord. We’ve already seen a Nova in Avengers vs. X-Men, with Tom Brevoort being particularly cagey about whether or not said Nova was the Ultimate Spider-Man character Sam Alexander or the original, Richard Rider; given the reappearance of Thanos, it’s looking very likely that the post-Avengers project that Bendis has mentioned would be hinted at in AA is going to be a Guardians of the Galaxy reboot… which, possibly, signals that mention of a GotG movie heralds that project’s official announcement soon (The team also showed up on Avengers: Earth’s Mightiest Heroes this past weekend. Holy synergy!). All that’s left is to wait for Star-Lord’s reappearance, I guess…
UPDATE: Tom Brevoort talked Thanos on Marvel.com: “More than simply bringing him back, this storyline will be setting him up for bigger things that are just off on the horizon—it’s the first step towards something we’ve been working on behind the scenes for a while now.”