Another issue that is important to me, is that the old settings had very defined art/styles, which was vital for their "feel".
Well, there's a clue we could look for. If we hear that someone from WotC has been talking to Brom or Larry Elmore, we'll know which setting to expect.

(Actually, Brom would only narrow it down to Dark Sun or Planescape, since he established the visual styles of both. And Larry Elmore is all over the place in old-school D&D. But if it's between Dark Sun and Dragonlance, there you are.)
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