Some of these replies are silly, custom cpu doesn't mean an architecture change like from powerPC to intel x86. It doesn't mean the end of hackintoshes, most all hackintoshes are made using cpu models that have never been released in a mac anyways. It's likely just a variant of the next sandy bridge xeon that apple will get access to before anyone else.
That's the point. Since hackintoshes can be made using CPU's that are generic, Apple may want to build custom CPU, which would make it impossible for them to build hackintoshes with, and make OS X somehow support only these custom CPU's.