I figured I'd pop my two cents in here for giggles, as I saw this a few days ago.
I work on game-stuffs myself, and to be perfectly honest, I'd be pretty embarrased even using those concepts in a proposal.
Why? Because of the WoW style on it.
Would Halo's universe make a good staging ground for an MMO? Of course. It's hugely expansive, lots of backstory and even more fighting. the problem is, Halo was built around the idea of epic confrontations, and even Halo Wars gives a sense of large-scale combat with all the crap exploding and going on. MMO RPGs(which is fairly well along the lines of what this was going to be if you note the 'special skills(spells)' bar in some of the concepts) arne't built well for epic-scale confrontations. They're made for grinding. Huge worlds, sure, but small-scale long-build grinds, and in the case of WoW, some pretty neat large-scale raids.
But that's all moot. Even figuring that 'if Halo Wars works, why not try other gameplay styles', the fact is the concepts, in their current state, pretty obviously are styled on a bank of 'Well, people like WoW, so lets run this thing as close as bloody-well possible to it and hope that some of them will play this too.'
We don't wannt World of Halocraft. We'd want a Halo MMO.
Could it be an RPG-style? Potentially, sure, though I don't think the gameplay is well suited for Halo.
When i about the idea of a Halo MMO, I thought along the lines of PlanetSide. an MMOFPS.
Oh, and the character that people were thinking was a cortana-style AI are wrong, it's apparently a 'Psionic' character, aka psychics and telekenisis or what have you. Which is the other reason I am loathe of this thing. 'We need a good way to do spell-er skills, but how!?' so they went and stuffed psychics into the concept.
At that point, when you're not even sustaining everything that Halo's backstory built it up to be, you more or less have a cheap-cash in on the WoW craze using a simplistic Halo total-conversion mod.
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