Dnj..., that's an easy one. The most obvious will be the inclusion of a few SA2 voices..., and you may or may not see the SA2 control buttons (found on the T3). You'll find more of the styles using the SA voices too. You'll most likely find a few new Cool, Sweet, and Live voices too.

I'm going to speculate that given the changes made between the T2 and T3.., there's a likely probability that the model that replaces the S-900 could be compared to the changes made between the PSR-2000 to the PSR-2100.

Poly will remain the same.., they probably won't change the design much, maybe a few new styles or just re-tweeked styles to use the SA technology. I just don't see Yamaha making a huge jump with the 900 replacement.

[This message has been edited by squeak_D (edited 10-07-2008).]