I can't find any news or explanation, but now when you search for "entourage edge" on Amazon.com you find only accessories, mostly skins. None in their warehouse, either.

My fertile imagination has Amazon coming out with an enTourage-designed ereader/tablet. Well, Amazon is rumored to be coming out with a tablet, and enTourage is rumored to be working on a new design -- it's possible! (But not likely . . . )