The pieces are in place for a spec bump (newer Xeons, ports, WX versions of AMD's graphics), but nothing specifically points to a new MP arriving soon - or ever, including this article. And no, Apple will not "free" Mac-OS.
The Mac community has reasonable expectations of some sort of iMac bump early to middle of next year. If a new nMP arrives along with it, great: the 'Pro will live on for another 3 years. If the iMac is bumped (I suspect a design refresh is in the works, actually) but not the Pro, then the latter is dead. Even Apple would likely be embarassed by it by then, and it ought to finally be axed.
Meanwhile, ladies and gentlemen, there's nothing to see. Wait, move on, or make your plans to do so. But don't expect the rumor mill to be more than an echo-chamber of baseless hopes and sheer speculation.
(I've mitigated the wait by having some fun with the highly-customizable and rather slick Manjaro Linux / KDE Plasma 5.8 on a one-click 4.6GHz Skylake, GTX 1070, etc.)