No one knew exactly what would get announced, but there were rumors ranging from Benedict Cumberbatch coming on-stage for Doctor Strange to Marvel re-acquiring Spider-Man. Instead, we ended up with bigger news than that...the entirety of Marvel's Phase 3 Slate...and here it is...
May 6, 2016 - Captain America: Civil War
November 4, 2016 - Doctor Strange
May 5, 2017 - Guardians of the Galaxy 2
July 28, 2017 - Thor: Ragnarok
November 3, 2017 - Black Panther (which Chadwick Boseman was announced as the star of)
May 4, 2018 - The Avengers: Infinity War Part 1
July 6, 2018 - Captain Marvel
November 2, 2018 - Inhumans
May 3, 2019 - The Avengers: Infinity War Part 2
Phew...this is definitely Marvel throwing down the gauntlet against their direct competitors at Warner Bros. This should make for fascinating writing over the next few years.
Additionally, here's the first piece of concept art from Black Panther, where Boseman is a heck of a choice.