Confirmed: it was Halo 4: Forward Unto Dawn. YouTube now has the official trailer up.
In May 2012 staff and students were told that a television pilot was filming on campus during the semester break. The student newspaper The Peak thought it might be filming for a Halo webseries (photos) from the set. It was a major production, as SFU turned off all the lights on the west side of the AQ which overlook Convocation Mall for two nights, and security guards asked us not to take more pictures. The name of the production did not appear on the Filming in Progress signs.
Among the videos on YouTube is this of the Master Chief and the shoot itself. http://www.youtube.com/watch?v=8E_XmEoB3b8
photos by GWe and CGCameron