Well they have the storyline draft of the script done, they are hiring a "talent" to do the full script so that they can start production sometime next year.
By "fast-tracking" I'm sure they mean making it a priority project, as it's next in line after Ant-man and Cap 3: TWS2
We will probably also hear some things about Thor 3 sometime next year as well, since I think Thor & Dr. Strange will probably release one after the other.
2015
A2 -> Ant-Man
2016
Cap 3 -> Dr. Strange -> ?Thor 3?
2017
?Hulk 2? -> ?GotG 2?
2018
?Capt. Marvel? -> Avengers 3