A quick look at the floorplans of the 2008 Game Developer Conference reveals that Microsoft and Epic have secured the two biggest floor spaces.
With the largest exhibit at the event, taking up 4,800 square ft of space, Microsoft will certainly have a bigger presence than in previous years, when Sony and Nintendo got the biggest areas to utilize this professionals-only game industry conference as a pre-E3 event.
Only second in size to Microsoft's space, Epic Games' presence at the event isn't surprising at all, since the developer always uses GDC to show the latest Unreal Engine technology.
Furthermore, both companies' spaces are in front of each other in the first level of the Moscone West Hall. This last detail wouldn't matter if it wasn't for the fact that the two companies worked closely on Gears of War.