I know there's another big bad, I just wish they'd keep the Covenant out of this story. I'd like to be pleasantly surprised, but so far I don't see how including the Covenant in this game is more than fanservice.
I disagree. Having a familiar enemy type representing the game's introduction to produce a small sense of iconic feeling as opposed to force-feeding CHANGE, CHANGE EVERYWHERE seems perfectly reasonable to me. Don't get me wrong - change in the series is fantastic and what we've been presented with so far from 343 is great and a nice step up from Bungie's recent stuff, but none of this should be overused and abused for the sheer sake of it. I want my Halo to still be recognizable as, well, Halo, and placing the Covenant in at least the beginning stages of the Reclaimer trilogy is the perfect way to do that. It's not like they'll be playing a role as supposedly gargantuan as the new enemy type.