I guess this can go here: Battlestar Galactica's Katee Sackhoff (Kara Thrace/Starbuck) rumoured to have been cast as Captain Marvel. Two pieces of information she recently posted to her Twitter feed add fuel to the fire.
i09 said:Speaking at Nerd HQ, Joss Whedon explained how the events of Captain America 2 would influence the Avengers sequel, saying:
The fact is, Ultron is a clear and present danger and Bucky's in the wind. We do mention the fact that that is [Captain America's] primary thing, but he is also working with the Avengers, too. We're not ignoring it, but he definitely has to deal with a mad eight-foot robot, because that's one of those things, you put it off and it just gets worse.
You can see the full interview at the link. [ Nerd HQ via Comic Book.com]
Footage is shown of the Avengers hanging out trying to lift Thor's hammer: Tony Stark can't do it; then Stark tries again with an Iron Man hand and fails; War Machine tries to help - still can't; Banner can't; Cap then movies the hammer a small amount, but then a noise distracts them. An older Iron Man suit is seen - it's Ultron! It's the footage previously described in a magazine article.
Various footage is then shown including Black Widow, Banner, tanks. Then the Hulkbuster armor is shown fighting against Iron Man.
The Avengers are also shown battered and bruised before Ultron with Captain America's broken shield revealed with Tony leaning over the Avengers looking horrified.