I think Shimano has an improved version of that motor coming out this spring.
Yeah the EP801 looks pretty good, some more sophisticated software and the ability to apply full 85nm torque in more situations/a wider cadence range. I think the mountings are unchanged but can’t seem to find a specific answer to that with a quick Google search.
From what I’ve heard a lot of high end e-bikes are being updated with these as the key feature for 2023 so who knows what availability will be like…my guess would be “constrained.”
But unless you’re doing short rides that need maximum torque a maximum % of the time, it doesn’t sound like an absolutely must-have upgrade. The actual motor isn’t changed much as I understand it.