As far as I can see Yamaha have their current version of a 76 key keyboard already. They are pushing the Motif version of a synth/arranger wantabe in the S70XS. It's what some might call a half sister or Tyros/Motif love child coupleing.
Not a true arranger but has 76 keys and hammer action for those piano style players; so why would they want to produce a 76 Tyros?

Allan