If I were them I wouldn't even bother with anything pre-Arm v9. That's going to draw all the hype, especially when Apple announces the Arm v9-based M2 next year.
And then I'm sure most sheep-like OEMs will say "Oh, we want THAT, too. Where is it - we want it yesterday!" But AMD won't be able to provide one too soon, because they would've gone all in on Arm v8, and they'd want to squeeze at least a couple of generations out of that microarchitecture.
Something similar happened when Apple announced the first Armv8 processor and it took Qualcomm and all the rest 2 years to catch-up.
And then I'm sure most sheep-like OEMs will say "Oh, we want THAT, too. Where is it - we want it yesterday!" But AMD won't be able to provide one too soon, because they would've gone all in on Arm v8, and they'd want to squeeze at least a couple of generations out of that microarchitecture.
Something similar happened when Apple announced the first Armv8 processor and it took Qualcomm and all the rest 2 years to catch-up.