It was known for a while already that AMD's ATI is developing a new product under codename R700. Guru3D has a nice preview of what AMD is going to launch real soon, the Dual-GPU based Radeon 48x0 X2 series of products.

In very short wording, you take a large PCB (printed circuit board), slap two 4870 processors and a bridge-chip on there and call it a Radeon 4870 X2. It's surely not the most elegant method of getting a graphics card in the high-end segment, it is however as this preview will show you, a very effective one.