Avengers: Infinity War - Every Character Confirmed So Far

Confirmed By: Kevin Feige called this one when he spoke to Empire and revealed that the Black Panther stand-alone has deep ties to Infinity War:

"This one is important. Not only do you get an unbelievable lead character, but you also get all of Wakanda which is a whole new setting and culture to explore. It's a big geo-political action adventure that focuses on the family and royal struggle of T'Challa in Wakanda, and what it means to be a king. T'Challa's story is very important to us as it links to the next Avengers films, which is why we brought it forward."

Plot Predictions: Had Feige not said that, it might have actually been pretty easy to dismiss Black Panther as being involved at all: he's got his own world after all, and he's not an Avengers (with the expectation that he MIGHT be a fully paid-up member by the end of Black Panther somehow).

So quite how his story in Wakanda directly informs Infinity War is exceptionally intriguing, and right now - without the movie to fill in some gaps - it's all very flummoxing.