They haven't really done much more with him than what you see in the first few issues. He shows up and is charming, debonair and seemingly wants to help Tony with the magic stuff.
Yeah that's what I think its odd, I kind of like that he doesn't have his iconic look for a change (I know the status quo will eventually come back) but its kind of weird that he doesn't act much like Doom. Although him just showing up eating potato chips was funny.