Just Cause 3 may appear at E3 2013, if our interpretation of a few not-so-subtle hints from Avalanche Studios founder Christofer Sundberg is correct. The enthusiastic Instagrammer posted an image of a man jumping from an airplane today, followed by this semi-cryptic response to a fan:
Sundberg posted another image to Instagram a few weeks ago, which shows the same man kicking an unfortunate motorcyclist off his ride atop a craggy path. We can't see the action-packed gentleman's face in either shot, but given his behavior and attire, it's a safe bet that we're looking at Just Cause 1 and 2 protagonist Rico Rodriguez. Or someone cosplaying as him.
Just Cause 3 has yet to be announced, but it's more or less an open secret that Avalanche is at work on the next in the sandbox series.