I found the following on another forum:

"My name is Hermann and I'm from Germany. The german homepage of Yamaha (Yamaha.de) informs us, that starting November 6/2017 there will be nationwide, daily keyboard presentations. Yamahas event list also shows the specific locations and the keyboard presenters. By the names of the presenters it is absolutely clear, that the successor of TYROS5 will be disclosed. I thought this would be of interest to you! There is however no hint, what the name of the new key will be :)))))
I will see the new flagship at my dealer on Nov 8/2017.

With best Regards
Hermann."

Not much longer to wait! However, for some of us, even a couple of months can seem a long time!