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If cortana is in the trailer then its obvious gravemind is in the game....they were together at the end of halo 2....
OMG THE PERSON WITH THE SMILEY FACES DRAWN ON THE PIC IS HILARIOUS!!! LOL GRUNTALOOB!!!!!!!!Posted by: GruntaloobOh my God you're right!http://img123.imageshack.us/img123/3769/gravemindcortana 2up.jpg I see it too!
I know. I'm the best.But really, it's nothing. As I said before, I've had friends find a grunt in this: picture. It's abstract and you're seeing things.
Cortana may just be Gravemind incarnate this game.