hawkeyefan
Legend
I agree with your points on why Dark Sun would be a good choice to roll out, though I doubt that Wizards would. I think that their list of publishing priorities starts and stops with "will it sell?" (That said, I think that Dark Sun is interesting, and I think it would sell... but I'll freely admit that I'm pretty biased about it.)
Well, yeah, definitely. If they put out something that they didn't expect to sell, it'd be a bit weird.
I think he pretty much narrowed the list down to the most likely settings already, with the exception of Ravenloft, which will be coming out soon, and Planescape, which kind of encompasses all the settings.
The four he listed are probably the most in demand and most likely to make a profit. Dark Sun's differences are its strength, but also its weakness. It's very different and so would offer the most in the form of new game mechanics and creatures and lore...but it's also pretty specific. If someone isn't into Athas then they probably won't get any products pertaining to it. Whereas a Greyhawk book of some sort could be easily modified to fit in the Realms.
It'll be interesting to see what they wind up doing, if this poll is indeed indicative that they are actually planning a new setting.