Still kinda early in the game lets wait and see what developed with the Montage it's just the beginning.
Thats what The Yamaha representatives said, they will be adding more features over the comming (year) .. In contradiction with the Faq, they allready confirmed VST 3.0 support... I.e. Using the Montage as a VST inside your DAW( hopefully more daws then just cubase)
The interface layout is quite well tought out.. The 4 rows of 8 buttons to the right correspond with the possition of ellements on the touchscreen...