So after today's exciting news on the Phase 3 film, I got to thinking how Marvel kind of answered some of our questions we had regarding Age of Ultron and some of the overarching storylines of Phase 3. This is what I believe could happen and could be considered spoilers so read at your own risk...
1) Thor will die in Age of Ultron: With the announcement of Thor: Ragnarok, it seems to be a likely choice that it will be Thor that will die in AOU. Not only will it be more of a powerful and emotional toll on the Avengers, to have him die at the hands of Ultron, will make it seem that Ultron is unstoppable. Also, as a post credit scene for AOU, Thor could wake up in Hel and see Odin there and realize what Loki has done.
2) Andy Serkis is definitely playing Ulysses Klaw: Having Black Panther announced today, pretty much confirms that he will be playing this character. With possibly scenes taking place in Wakanda, it only seems right. Also, it would have been silly for Marvel to say that Serkis was going to be playing Klaw early on, because that would have most likely shown their hand that Black Panther was coming sooner than later.
3) Bruce Banner creates Vision, not Ultron: In a recent interview with Mark Ruffalo, he calls Vision "his my baby", which kind of confirms that he will create Vision. I think its a great dynamic to have Stark create evil in the form of Ultron and to have the other science buddy create good in Vision. Definitely will create tension between the two friends.
4) Scarlett Witch will get inside all of the Avengers' heads: In the clip seen today at the press event, Stark and Rogers talk about that "that Maximoff twin got to see things". I'm guessing she makes them see the good (Cap's vision with Peggy Carter seen quickly in the trailer), and the bad (Hulk sees himself killing Black Widow or fighting an unseen enemy, which makes him go insane and that where the Hulkbuster scene comes in).
5) Scarlett Witch and Quicksilver are Inhumans: This is a little bit of a stretch but remember in the post credit scene of CWS, where they reference that the twins were the only test subjects to survive? What if the MCU version of the Terrigan Mists come from Loki's Staff.
6) Thor 3 will lead to Infinity Gauntlet getting in the hands of Thanos: Today, Kevin Feige stated that Thor 3, will be like the CWS of Phase 3, where everything changes because of it. I believe that Thanos will somehow get his hands on the gauntlet and the film could include the Time Gem.
If there is any other ideas that I missed that you would like to see comment below...Thanks for the read