My guess is we won’t ever see anything more than what can also fit in a Studio. It’s just not worth the extra R&D for whatever fancy interposer tech they’d need to make a standout Mac Pro
The strange part is the M MacPro still has the monster 100W power supply from the intel days. Why on earth did they leave that?
It's a little overbuilt, but a 1000w for a 300w processor with ability to add a lot of accessories isn't terrible actually. only needs a few more PCIe devices to make it meet the 50% minimum to reach peak efficieny on the PSU.
For your PCI devices and whatever they may draw.
Expansion ports. Arguably, the redesign you're looking for is the Mac Studio.