If my reading is correct,

A 61 note version with no speakers,

and a 76 note version with no speakers,

They will be identical to the current version just with the addition of keys and minus speakers?

The only word I've had from Generalmusic is that there would be a 61 key version with no speakers. Anything else is speculation at this time.
George Kaye
Kaye's Music Scene
Reseda, California