I don't know that I would put too much faith in Dark Sun coming based on MM's twitter. After all, he has also tweeted a lot about PoL/Nerath Valle, and the closest that came to coming to fruition is that the drow arachnomancer in MToF is based on his NV Lolth-patron warlock (which makes it at least the third NPC warlock with a pact that isn't officially available for PC's [also the fathomer in PotA and the princess in ToA]).
http://forgottenrealms.wikia.com/wiki/Mwaxanaré
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