Well not really. There have been several Mystara teasers inserted into D&D 4E books. Now WotC makes use of another iconic Mystara location in their new Lair Assault Program. I don't really know what Lair Assault is all about, but apparently it is a kind of adventure to be played in stores, similar to their Encounters series. Encounters used the Keep on the Borderlands and in March, Lair Assault will be using the Isle of Dread. Ofcourse current policy at WotC is to disassociate various D&D locations from their respective settings, but you know what? There is nothing stopping us from associating them right back where they belong! :)

More here: http://blackmoormystara.blogspot.com/20 ... to-4e.html

-Havard