We've been hearing for months that Marvel is looking to add Ms. Marvel/Captain Marvel to the MCU lineup. News broke last year that Marvel had indeed put together a script (outline/early draft) for a movie and the project was in active development at the studio. Even before that there were candidates named which included Emily Blunt (Edge of Tomorrow, Looper) and Ruth Wilson (Luther, Lone Ranger, Saving Mr. Banks).
BadassDigest was actually able to get a comment from Marvel's Kevin Feige on the prospect of a Captain Marvel film. Feige confirms that studio has talked about the project, which is the first official word from Marvel about a possible film . Devin adds, he has heard from a source we could see her onscreen in 2016 (a cameo in Captain America 3 sounds about right). Speculating her solo film (exploring her origin) might come out between 2017-2018, possibly being apart of the Phase Three plans. My only problem is that while a cosmic film in Phase Three will likely be needed, having two-Captain titled Marvel films might be too confusing for the general audience. That said, BAD has a decent track-record on breaking Marvel tidbits like this.