This rumor has got to be a load of BS. Intel and Apple are just starting to gel together and both loved collaborating on the MBA.
Or so they say ...
So if Apple farts around trying another transition away from intel chipsets they probably won't be releasing new designs until well in the future. You just don't design and fabricate new chipsets overnight.
Who say it is overnight? How long has Apple owned PA Semi. Additionally, I believe Apple collaborated with them back when they were still on the PPC chips. You'd be surprised what a great set of designers can put together in a short time. Perhaps PA Semi had IP (intellectual property) already in place that Apple decided to grab up by buying the company. I believe at the purchase, Apple stated they were buying the company for it's chip designers and intellectual property (focused heavily on low-power chips/chipsets). And by owning the company and the IP, Apple can decide who does and doesn't get it ... i.e. ... "[computers/devices] that other companies can't match."