I'm not so sure there is going to be a buyer for Hummer. China may have wanted it a while ago, but they are starting to feel the crunch too, combined with that fact that new taxes on large vehicles are going to ad something like 30% to the sticker cost there.
I think the reality is that Hummer, Saab and probably Saturn are all going to be shuttered.
Hummer doesn't impact GM that much by selling it, much of the production is outside of GM owned plants.
H1/H2 production is AM General, with the H3 being the only product made by GM.
Hummer is a niche product with a small market that can be run by a company without a large overhead.
There's a few interested buyers, which is the reason the deal isn't finalized yet.
AM General retained the Humvee(tm) trademark separate from GM, which is interesting as it leaves another avenue that AMG could potentially exploit down the road.
The flavor of the week rumor as far as american interests are concerned, is Navistar who is on again, off again about buying GM's medium truck lines [ie. Topkick] and some of the Pickup line along with, supposedly Hummer. That would be odd as Navistar and AM General are competitors when it comes to military vehicles [on the other hand Navistar fabricates the Optimizer blocks for the military HMMWV's].
One recent rumor is that AM General and Chengfeng are partnering up to "buy back" the brand.
Then we have India/Arab and Russian interests who are interested in picking up the brand.
GM annouced they're talking with parties and an annoucement will be made "soon" [I'm guessing sometime this quarter]