> Our niche would go grazy if someone did that with PowerPC. ;-)
> (getting board from local x86 shop + plug compatible PPC on it)

That's probably not how Skybridge will work:

"I don't expect we'll see standard socketed desktop boards that are compatible with both ARM and x86 SoCs, but a pin compatible design will have some benefits for embedded, BGA solutions."
http://www.anandtech.com/show/7989/amd-announces-project-skybridge-pincompatible-arm-and-x86-socs-in-2015