I'm not quite jaded enough to think that Apple won't release a new Mac Pro this year, or, that it will be a non-upgradable & expensive design failure.
So, my vote is on... wait and see.
But, having said that, I wonder how many of us will actually be able to afford to buy it. I'm pretty sure I can't justify putting out the cash that Apple will be asking for it.
It'll likely be "2019 Mac Pro vs. divorce" in my case. 😵