Well I missed some cool discussions. o_o :P Catch-up time!
That cover base looks very cool. Having the two Thingguys next to each other in those two poses to the left sounds good to me. Jonna can be wherever, I don't mind too much where she ends up. :P I agree that thedude, Talmid, Thingguy and Luke should all be on the cover. It might help balance things out of there's another bad guy somewhere in there, too. It'd be awesome to have Stirling, Iamos and Dewin all somewhere on there too, but as was previously stated we're not sure how big their roles will be. Presumably Dewin will have a smaller role than the two of them, seeing as he's not someone's personal character, so I think Stirling and Iamos should have preference over him.
I like the thought of Brocktree being somewhere. He's important to a lot of stuff, and he'll probably be pretty active in SA based on what Thingguy has already written. Maybe he could be in the top right pose, and Luke could be moved to one of the three bottom right poses?