The next two-part Avengers film is the cosmic threat mega team up, just no FF or X-Men taking part, or their characters like Galactus (Unless the new FF film flops and the rights get sold back.)
Both Fox and Marvel own the film rights to the Scarlet Witch and Quicksilver characters. Marvel owns them as the superhero members of the Avengers, Fox owns them as the children of Magneto and members of the Brotherhood of Evil Mutants. And that's how they've been used, more or less.
Vibranium is a long standing Marvel Universe natural metal that predates the man-made Adamantium alloy. It's unlikely something a studio has a film rights to, but it is strongly associated with Wolverine.This is also why Marvel can't use the word "Adamantium" in their movieverse, and instead use the word "Vibranium."
Marvel have the film rights to make a Hulk film. Universal just holds distribution rights.*I'm not entirely sure about how the rights for Hulk works. Hulk (2003) was made by Universal, and The Incredible Hulk was made by Universal but produced by Marvel. Marvel are able to use the Hulk in their Avengers films, and they are certainly able to even reference his origins (even directly linking it with Captain America's back story). But as I understand it, it's still Universal and not Marvel who still owns the rights to make stand alone Hulk films.