Wait for what?
Every manufacturer has a money making line up.. There isn't anything that can get better.. just fix the bugs (easy update fixes)
Yamaha has the Genos and SX x900, and when new models do appear..it will be repackaged just like Yamaha always does.. The Montage and the low end version DX?? will keep Yamaha people happy. Korg will continue the repackaged PA series, and people will buy it.. and their high end workstation will continue with the same features..
Roland has more money making lines than anyone.. Fantom will dominate,
Their effects, replicate keyboards, digital pianos will continue to be big,, And the inexpensive EA7 will line their pockets...so they don't need a new top model arranger (PS: it is in the making)
Like I said... wait for what?
Donny pick any of the keyboards you have tried... stay with it and learn the dang thing... then maybe you will find what you are looking for