Thor: The Dark World

Valkyrie is a movie now in planned production.

Production History
Avi Arad has stated that it is more likely that Valkyrie get a supporting character role in another movie but a Valkyrie spin-off is always possible.

Resources
http://celluloidandcigaretteburns.blogspot.com/2010/01/feige-talks-avengers-future-marvel.html