I'm gonna see if anything is announced at WWDC (apple conference in june?).....
From what I've heard, the Mac Pro won't be coming out likely till well into mid 2019.
I have an old MBP 2011.....I've upgraded it with internal SSD, I have SSD thunderbolt drives attached.
I over maxed it out with 16GB ram.
I can't go any further with it, and it is showing its age....I"m actually not creating as much as I'd like due to this, sadly.
I think I will go with a medium iMac pro soon...likely in the $8K range.
I have been in talks with Apple Business and they offer things not offered to consumers. I may look at leasing this iMac pro.....and once the Mac Pro comes out, maybe even has a revision....I'll possibly trade it the iMac pro and other lease or buy the Mac Pro.
But would be nice not to have to suffer lack of resources longer than I already have.