Novody knows nothing about the new Mac Pro...
I would expect at least 2 Apple PCIe 3.0 SSD ports in the 7,1 Mac Pro, leveraging their x4 proprietary connector. The use of interface adapters from Sintech.cn may be an option to adapt 3rd party m.2 ssds, like the samsung 970 pro, on the platform, if it's allowed by the T3 and space is available.
pic of dual/raid 0 apple ssds shipped with the imac pro