Disney Interactive Studios and the company's Internet Group will merge into one unit, named Disney Interactive Media Group. Disney Interactive Studios has published games like Hannah Montana, High School Musical and Turok; meanwhile, the internet division was responsible for hundreds of online casual games and Pirates of the Caribbean Online. Clearly, the merger makes sense, and can be likened to when Sony Online Entertainment became part of SCEI.
Variety speculates the merger is so that Disney can report all its digital revenues in one spot, instead of games being lumped in with the consumer products. It doesn't appear many (if any) pink slips will be handed out in the unification, as these seemingly offline and online games divisions continue doing their separate things.
Source -- Disney Merging WDIG Group With Games Unit
Source -- AllThingsD Iger memo