I have tons of new ideas for what will be revealed at the end of [The Avengers: Age Of Ultron](movie:293035), when the gigantic battle with Ultron is over.
1. A New Hero
After Avengers 2, a bunch of new heroes are going to hit the big screen. Ant-Man will appear just months after the hit sequel, Doctor Strange in 2016, and Black Panther will get his solo movie in 2017, but he will make his first appearance in the MCU in Captain America: Civil War. I think [Black Panther](movie:9047) will have some connections the the after-credits scene because Ulysses Klaw is confirmed for AOU so the movie will have some deep connections to BP. It could also be Ant-Man because his movie is going to be released so close to Age Of Ultron. Most people have forgotten about [Doctor Strange](movie:559685) with the announcements of all these new movies but, you never know. Even Daredevil could make it into Avengers 2!
2. Guardians Of The Galaxy
Another possibility is that the after-credits scene will check up on our favorite intergalactic superheroes after their awesome adventure last year. Maybe it will show us Adam Warlock or how much Groot has grown after he was destroyed in the process of defeating Ronan.
3. A Returning/Rising Villain.
Ultron is an artificial intelligence which can't be destroyed so after Avengers 2, Ultron won't be gone. It could also reveal how Ulysses Klaw will get his powers or how Thanos will get his next Infinity Stone.
4. Shawarma II
Marvel could go with a very simple after-credits scene or make two of them like in [The Avengers](movie:9040). The first scene could be a big reveal, and the second could be something simple.
5. Infinity War
Like I said with the villain theory, this could feature Thanos and Nebula finding a new Gem. I would say The Aether is the mind or power gem, The Orb is probably the power gem, and The Tesseract is the space gem. You will probably understand why I didn't even mention Loki's staff in my Inhumans/[Agents of S.H.I.E.L.D.](series:722469)/Age Of Ultron theory article coming soon.
6. Thor's Adventures In...SPACE!
Thor is all but confirmed to be going through some trauma in Avengers 2 so the after-credits scene could explain what has happened to Thor and what will happen in [Thor: Ragnarok](movie:956858). I am going to assume that he will be there for the first and last portion of the movie, but gone in the middle.
7. Spider Man!
He's going to be in Civil War, so why not? ALL the fans will love it. They might as well.
Tell me your ideas in the comments below!