This has been in work for a while:
Hot on the heels of the successful summer blockbuster Guardians of the Galaxy, Star-Lord and his motley crew are heading to television.
Disney XD announced Friday during New York Comic Con that it has ordered an animated Marvel's Guardians of the Galaxy series to launch in 2015 during the network's "Marvel Universe" block. ...
Prior to this announcement, Marvel Animation's California studio had been developing this series. I asked an exec weeks ago if the show was still under wraps. He said "YES."
So, I kept my trap shut and typing fingers quiet. The animation studio is working on the Guardians animated show in a separate location from its Flower Street studio in Glendale.
Secrets must be kept.