It's been speculated that Colm Feore's role in Thor, which has gone persistently unidentified past the point where all the other principals have gotten names, etc., is as Thanos.
Ooooh. I would have never thought of him but that would be cool.
WOW! Even better:
The characters being considered for inclusion are: Captain Marvel (an amalgam of Mar-Vell and Noh-Varr), Adam Worlock, Black Bolt and Nova.
rlock, dammit! But I'll overlook the typo for my favorite character of all time. Jim Caveziel is the obvious choice for him. Matthew Fox for Black Bolt and Ryan McPartlin (we'll find a role for him yet!) as Captain Marvel.