I've been requesting this since day one when they announced that the game would be featured in the app. But Bungie still haven't said a word, they just continue to neglect WP-users, even thought it's a growing customer base. It wouldn't be any hard for them to port either, unless they've made some extremly stupid coding. There are lot's of talented developers for WP, just give them access to the source and it would be done in no time.