It looks like a great way to bootstrap their licensees into spaces they usually don't build for. Right now there are very few ARM-based SoCs competitive in the desktop space and having a set of reference designs, with a mix of fast and efficient cores and personal computer networking and graphics could open up a market now underserved by repurposed set-top and mobile parts.
I would be delighted with an ARM with a dozen efficient cores and a couple fast ones.
I'd be equally delighted by a RISC-V with a bunch of efficient cores and a couple fast ones. Or s390x cores, POWER, MIPS... But until someone makes that kind of part in sufficient volumes, it won't be cheap.
I would be delighted with an ARM with a dozen efficient cores and a couple fast ones.