What exactly is new on the PSR S900 over the PSR3000?

5 more Mega voices
23 more super articulation voices
8 more Sweet Voices
8 more Cool Voices
1 more Live Voice
2 more drum voices

Extra polyphany.

No aux out like the PSR3000
No smart media slot like the PSR3000

It is extremely measley improvement given that Yamaha had three years to develop this keyboard. There are going to be a lot of styles - 95% of which are probably already on the Tyros II. So we'll get maybe 15 new styles - those of us who already have the Tyros II styles.

Beakybird