[1] https://www.tomshardware.com/news/intel-xeon-cascade-lake-w-...
But yes, I would expect a dual die 64 core monster like the 92xx series they recently announced. Of course the 300W power/thermal solution apple was talking about seems a bit limiting in that case.
AMD definitely has a superior offering with Threadripper 3 but we haven't seen what Intel is going to offer in comparison. And switching CPU manufacturers is never trial.
That being said, if you were only allowed to pick one platform to sell to your customers, in a machine which should last years, then Intel would definitely be the safer bet. It’s also the platform most of the software providers are likely gonna optimize first.
Maybe there is a technical reason but the story I've gotten from people I know doing this is that they are looked down on if they're PC users. It could be that Apple's software is that much better but it seems much more likely that they're charging what they know they can based on the generally stubbornness folks have around their software and workflow. I partly can't blame them, if your job is in a creative space the last thing I'd want to do is constantly rework a workflow and deal with the machinery itself rather than the content and output.
I so want to buy that CPU, but I'm starting to suspect it might never be released.
The upcoming AMD Threadripper 3 CPUs with PCIe4 would be a much better Pro offering. Clock-for-clock they are beating Skylake now, rumored to have up to 64 cores. Also, PCIe4-based RAID 0 arrays are pushing 15GB/sec transfer speeds IIRC.