"This film has been in the works almost as long as Doctor Strange or Guardians of the Galaxy before it came out, and one of the key things was figuring out what we wanted to do with it. Her adventures are very earthbound, but her powers are based in the cosmic realm.”
Like I've stated dozens of times, Marvel has a draft already in place. However, a new writer and director aren't ready to be announced. Production on the film more than likely won't begin until 2017, they the studio has plenty of time to find a director. There are already rumblings she'll have a cameo in Age of Ultron, this announcement will likely keep that rumor kicking until it's confirmed or debunked in May.