Microsoft's Phil Spencer has confirmed that Halo will be making an appearance in some shape or form at E3 this year.
Seeing as how the company promised Xbox One owners a new Halo game by the end of 2014, I'd say the Master Chief's appearance at this year's Electronic Entertainment Expo was a given anyway.
Speaking to a fan on Twitter, Spencer said, "Halo news will be coming at E3. 343i has a great plan in place, will be cool to share with everyone."
Might that "plan" have something to do with an anniversary edition of Halo 2? Voice actor Steve Downes seems to think so.