You knew it would happen. There is no reason to have thought otherwise. In any case, here is the E3 2012 trailer for Halo 4 (with gameplay footage), complete with your friend, Master Chief.
[youtube http://www.youtube.com/watch?v=iq1e_jKe39c&w=620]
It looks like Chief can now scan environments in a Metroid: Prime-esque sort of way. The jungle shown definitely had enemies that are new to the series, but other than that, what was shown seems pretty much par for the course.
Jump back into the green armor on November 6.