Exactly why Fox should just give the rights to Marvel. Of course, they would never just do that. It's just quite annoying since I want Avengers 2 to be as great as possible. I'm not really an X-Men fan either.

Yup it's a bit hard to present quicksilver specially if they wont mention him as a mutant and a son of magneto. On the other hand singer just wanted quicksilver in the movie for some action scenes and some elaborate sequences that he feels will work with quicksilver.

Well, they can't have Thanos as the villain yet, and Joss thinks Quicksilver and Scarlet are perfect to be the villains for Avengers 2. Ant-Man was actually apart of the original Avengers roster, and Captain America wasn't. Plus, when you make a sequel, you need to inflate the action and introduce more things or people will feel like they're watching the same thing again. Marvel has all these characters they want to make movies for, so they might as well add them to the MCU to create of the biggest movie universes ever.