The Mac Pro line of Apple's high-end desktop computers hasn't been updated in years. The super expensive iMac Pro was released last month almost as a stop-gap to the all-new mac Pro that's expected this year. We are all assuming that it will support modular upgradability as promised by Apple.
However, Intel’s Xeon CPU family is expected to feature in this new Mac Pro especially since the iMac Pro already makes use of them. My opinion is that Apple should use AMD’s Ryzen Threadripper CPUs in the new Mac Pro.
The Threadripper CPU range features large core counts with the top-of-the-range 1950X boasting 16 cores and 32 threads. This CPU has already shown it’s ability in tearing through CPU-intensive tasks like video encoding /editing, image rendering etc which makes it the perfect choice for the Mac Pro.
Actually, the entire range of AMD’s Ryzen CPU family would be suited to the iMac, Mac mini and Mac Pro lineup since they all excel in content creation when compared to intel CPUs. Since Apple already make use of AMD GPUs in their Macs, this may not be as far fetched as it seems. The only thing we see that may be an issue would be the high power consumption/heat of the AMD Ryzen lineup.
Sadly, Apple moving to AMD CPUs is highly unlikely and Apple will almost certainly continue using Intel CPUs across the board. However, Apple's insistence on using intel CPUs despite the availability of the superior AMD Ryzen range in terms of content creation will drive away existing customers to alternate platforms. Hopefully 2018 will be the year that Apple decide to give their customers what they really want.