If it is pin, power, heat and form compatible with the Go 6800, then it would have taken some purposeful design to keep it out of the 9300. That might indeed be true. But if it was done like that I think in the long term Dell will gain 'some' bad marks, because upgradeability is going to be a more important measure of laptop value going forward than it has been in the past. Having a historic pattern of denying upgradeability is not a good precedent really, given where the market is going.
That said, it's a done deal. If that's the way the 9300 was made, that's the way it is. I just hope not since it won't reflect well on them imo.
As for the Go 7800 ultra - maybe they won't bother because you can OC the 7800 Go GTX just fine? Honestly the 7800 "ultra" is in the form of the 7800's that clock about 500mhz plus. So not putting out an "ultra" but letting people build "ultra versions" is about the same thing. At the time of release of the 6800 Go, the word was there would be no ultra either. Now even saying that, its not coming out Sep 29th for sure. And given the performance and the likely clockability of the 7800 Go GTX, I don't think even power users would have to wait around to hope for an ultra. The current 7800 Go should be quite nice, and a good match to the dual core Turion, or the Yonah chip.
So we'll see right?