We certainly don’t expect to see a lot that will even confirm which characters will appear in Avengers 4, as that can potentially be a major spoiler for Avengers 3.
While we do expect Avengers 4 to be the last MCU movie for several characters, it’s also possible that part three could actually be the last movie for some, just to keep us all on our toes.
The image posted to Facebook could be one of Captain America’s gloves, or it could just be one of the Russo Brothers filming someplace where it’s cold.
Either way, we’re guessing that whatever other pictures they send out over the next few weeks will be just as vague.