Yamaha would never call an instrument `the ultimate`because that would say something about the other instruments.. so it looks like a fake
But there are some rumors
At Gearslutz there is another Yamaha Rumor going around about a Motif XF workstation replacement..
Korg´s CEO hinted for a new Korg at Namm, with a name 8 letters and starting with a P
Roland has also hinted for something major and sensational in 2018, but no word if that is going to make the Namm.
Akai will be there with an 88 controller for VIP
and Casio will finally show their PX/5S follow up
So far for rumors and predictions i found on the worldwide webs
Korg PA4x(76), korg Kronos 88, Ipad, Macbook, Mainstage3, Komplete Ultimate12, Omnisphere2.5, Keyscape, Trilian, Serum, pianoteq5, Ivory2, Blue2, Zebra2, Diva, Hive, V/collection, Synthmaster2.8, Halion 6, Superior drummer. http://keyszone.boards.net