So Mearls briefly touched on a list of top five settings recently, and AICN's latest tabletop column revisits a rumour that's been circling a bit.
http://www.aintitcool.com/node/63941
A rumor has been going around that WotC is approaching the various creators of their most iconic game worlds to bring them back in some capacity as the worlds are re-created or re-imagined for the next edition of D&D. Ed Greenwood’s firmly on board, as he’s writing a monthly column on Forgotten Realms. In a Q&A on the #RPGnet IRC chatroom, Margaret Weis has stated she would be willing to work with Wizards of the Coast again (Kender are a subrace of Halfling that only exist in the Dragonlance world), while Keith Baker (creator of Eberron) has stated that he has been in talks with WotC but “they haven't decided what form setting support is going to take yet”.
http://www.aintitcool.com/node/63941