It may not be what we all want it to be, but we know it's going to be powerful, otherwise what's the point? The iMacPro is beast as it is, or at least it was when it came out, thermals aside. Top spec iMac is pretty powerful now too. Even the new MacMini is pretty dope. We can be assured the MacPro will be made to one up the iMacPro. Apple's been on a better trend with hardware lately, the updates on the MacBookPros are clear indication of that, expecially if they update them again soon like expected.
It's going to have powerful processor options. Possibly dual socket?
At least a 128GB RAM option or more, 256?
At least one fast PCIe SSD Boot drive, hopefully at least two physical SSDs.
Same IO as the iMacPro or more...4 Thunderbolt 3, 4 USB-A, 10gbe (x2?)
GPU options? Probably at least two? Not sure if standard PCIe. AMD only?
One or two free PCIe slots? Here's hoping.
Oh...and it will come in Space Gray.