Some of you may not agree, but we are all grasping at straws any way.
These low power chips will be going into iPhone, iPods, Apple TV and other upcoming devices. For two reasons:
a) Less heat and low power utilization
b) Less clones
While they are currently PPC compatible, the next iteration could have new instruction sets added to facilitate some operations like media, encryption and other functions, also the memory handling could be different and the I/O could be different. This should prevent cloners from creating a device that can run the Apple developed software and create an exact clone of these consumer devices. These chips do not have to remain compatible with PPC, but be PPC based.
As Apple would control the supply of the chips, others can not insert those chips on their clones.
Many years from now, they may be used for laptops and desktops, but I do not think that is where Apple is going with them. I think the "Mac" will remain Intel based for quite a while more.
Just my opinion.