I guess we could wish for it all , but in the real world , I think this is what we will get:
More polyphony , say 192 or >
More SA sounds.
More and updated Styles.
It will still have a HD , no SSD for the T-3.
Greater RAM capacity.
Sliders and Control Knobs + Assignable Buttons
USB 2.0 / USB Recording
What I would like to see.
Digital Audio Out
HDMI
2 Lower Voices
Better Drums
Guitar Mode
I really would like to get my hopes up , but I do believe that Yamaha will give the T-3 what it needs to stay current , I guess anything else will be just "icing on the cake" ... so to speak!
In any event we have all the next few months to think about it.
All we can really do is wait

Later,

Gary