Well looks like the Super Articulation voices on the T2's have already been replaced, and they didn't give them to the Tyros owners--you'll have to wait until the T3 comes out.

The new Motif series has Expanded Articulation voices. These go beyond the SA voices and give the user more control over various nuances (something I've been complaining about in terms of the current SA voices)

This info comes directly from Yamaha as well.