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Thunderbolt 3 coming- but probably not for a while.
https://www.macrumors.com/2014/04/21/thunderbolt-third-generation-details/
The highlights-
• 40Gb/s
• lower power consumption
• new connector, but backward comparable via adaptors.
• PCIe g3 support.Don’t get too excited (or concerned that your new MacPro is already obsolete); the processors referenced in the article put the release of TB3 at probably late 2015 or early 2016. I think that about the same revision time as TB1 to TB2.
At 40Gb/s, I still don’t think TB3 can handle all cards that would previously have used traditional PCIe slots. 16-lane cards are probably still out. But it is getting closer.