Daredevil, to my knowledge, has never been an actual Avenger. He's guest starred on a few adventures and been offered membership but never accepted as far as I can recall.
Doesn't mean he won't get a movie though. Nor be seen assisting in an Avenger movie akin to how he's done in the comics.
Since MCU Phase Two is locked down though the earliest time frame I'd wager to see a DD film is 2016-2020 a loose possible time frame for Phase Three films I'd guess.