Captain America: The Winter Soldier
This title means that Ed Brubaker's famous decision to bring Cap's WWII sidekick Bucky Barnes back from the dead will be hitting the big screen April 2014. Sebastian Stan played Bucky in the film, though he was given a slightly different death seen. Still, as everyone knows, falling to your death is the least permanent form of death ever invented in film or comics. Along with the Ultimates, Brubaker's Winter Soldier storyline is one of the main reasons I started reading comics, so I couldn't be more excited about this news. Also, Community's Russo brothers were confirmed to direct.
Update: Google reveals that Stan did sign a multi-year deal, so I expect his return to be announced shortly.
Iron Man 3
Visually, the big news here is the new suit. It's very gold, and I haven't decided if I'm totally sold on that. I like that it reminds me of the Mark V suitcase armor, and since the original Iron Man was gold, I don't mind this. The more exciting thing was that director Shane Black was asked straight out about Extremis and he confirmed they're doing that in the movie. At the panel, Ben Kingsley was confirmed to be playing The Mandarin, while the Iron Patriot armor was confirmed as the new look for War Machine. You can watch a video of the full panel at ComicBookMovie.com.
Thor: The Dark World
This title tells, well, noting. Sadly, Mads Mikkelsen has dropped out of the villain roll, but Chuck's Zachary Levi is confirmed to appear. Game of Thrones Alan Taylor will direct, and there should be a lot more news soon as filming begins.
Edgar Wright showed off his recent test footage, and explained that he envisions Ant-Man as a hero who could look better on film than the comic page, and that's good thing. There's no release date yet, but there is a logo, and the response to the footage is incredibly positive. No news on casting yet, though Wright regular Simon Pegg has mentioned he'd like to play a villain, so make that happen!
Last but not least, Marvel confirmed that the second film will feature the relatively unknown Guardians of the Galaxy. All you really need to know is that it has a racoon who carries giant guns, and a green woman who wears skimpy outfits. Also, there's tree. In terms of the Marvel Cinematic Universe, expect this to set up Thanos, the red guy glimpsed during The Avengers credit sequence and will mostly likely set him up as the villain of Avengers 2.