Almost inconceivable. Intel does the logic boards and everyone takes apart the new models - so for them to put in the chipset and not announce would be incredibly odd IMO.
Thunderbolt is pretty obvious - but we will have to wait till someone pokes at the innards to know for sure.
I"m guessing Apple wants NVMe storage for all the hardware it puts TB3 in.
So - Mac Pro storage upgrade / resdesign
MacBook Pro storage upgrade / redesign new chipsets - new logic board in addition to the CPU bump oops - glad I general chatted in the mod room as opposed to the opposite...