Depends on whether Yamaha sell a boatload of the first one or two, I suppose...
Maybe now they'll get around to producing a few (more, if you believe the T3 hype!) punchy drum kits, some nice multi velocity high quality drums with a bit of 'air' around them
Maybe another brush kit and something with some crack! for contemporary alternative rock and pop...
I'd be curious if they can produce voice packs that use the SA2 engine though.... now THAT would be a breakthrough!