Halo MMO Project Was In The Works

Gamasutra have reported that Ensemble Studios, who closed down recently, were indeed working on a Halo MMO. The project was being developed from 2006 to 2007 but then it was cancelled before any announcement was made.

Now some concept art and a mock-up screenshot have been revealed for people to see. As for why it was cancelled? We won't know until someone spills the beans

Source: Kotaku