I'm hoping it's Scott Lang's Ant Man and not Hank Pym and Janet. Pym has too many issues that are way too heavy for a Disney owned comic book movie, and it's something i think that is integral to Pym's character , they can't just leave it out like they're doing with Tony Stark's Alcoholism.
They've said it could actually be both, but there's no confirmation either way. The earliest drafts had Pym as Ant-Man in the past, with Lang somehow coming along the suit/powers and teaming up with Pym. I'm not a fan of this idea, but it's almost certainly been rewritten because it was crafted prior to most of the Marvel movies and didn't mesh with the established MCU. Either way, I'm pretty sure they won't include the wife-beating aspect of Pym in the first movie. haha
Also, I'd say they haven't left out Stark's alcoholism. It was a pretty big aspect of Iron Man 2, but, given reports of Stark exhibiting an almost PTSD reaction to the events in The Avengers, I think you could maybe see him back to some of those tendencies in Iron Man 3.
I certainly hope so too, but we'll see.
Technically, vibranium has been on film several times now with Cap's shield. haha
I've always liked the Viggo idea. I also wouldn't mind Jim Caviezel or Benedict Cumberbatch. For a more obscure pick, perhaps Jon Hamm.