Anyone on the outside looking in at Demigod would get the impression that the Stardock/GPG team up was a mess, but in reality it was quite impressive. And I can't imagine another publisher providing as much support and involvement as Stardock did. At least that was the impression I got as a beta tester.
Demigod's problems were due to design decisions that in hindsight proved to be a mistake. Mistakes both companys have hopefully learned from.
I think another GPG/Stardock teamup would be great though there are a lot of buisness decisions that go beyond "Lets work with that Frogboy guy again" that are outside the scope of my understanding.