Oh, that's easy warlord

You see, being a prequel to the first Halo game, this game is actually how our dear friend John manages to get lucky, survive the battle of Reach and Reach Halo. Ergo, Halo Reach .

It's all about the benjamin's Halo's baby!

Yeah, we'll probably get some plug like that in ODST (when you beat the game on legendary) that ties to the first Halo. Also, I'm pretty sure we'll see a few more new skulls. ODST had some support for a few new ones but they never made it to release. I'm pretty sure the "director's cut" skull will this time though.