here's my guess:
This is going to be a highly customizable CPU miner that will be able to account for XMR devs doing any form of algo changing. Kinda like how the X3 was rumored to be able to do this.
Not "any form of algo change". That would make it just an array of general purpose CPUs. As I mentioned flexibilty has a compromise in performance.
The more it's customized for RandomX the faster it is but also the less flexible it is.
You can be sure Monero will try to sidestep any flexibility built in to the X5. They won't simply switch to a variant of RandomX.