The 300 sounds are actually going to be registrations made by the various Yamaha demonstrators. The sounds will also be normal edits of the internal voices.

The IDC is having a massive update as well, so we should see some new styles, songs, sheet music etc. Hopefully a new OS update with a few bugs ironed out.

I've heard on the grapevine that these 300 sounds are going to be made available on a USB stick. I'm assuming the reason for this could be that Yamaha may use a read only USB stick which would be very beneficial for them as it would stop anyone copying their new sounds/registrations to anyone else. Yamaha still have to make money you know, so the idea of only being able to hear and use these sounds when the USB stick is attached to the T2 isn't as silly as it first appears to be.

Other things are a new lower keyboard and pedal board, possibly may be called a T2 pro and I'm assuming the extra keyboard and pedals will be available separately too.

Looks like good things are ahead for all T2 owners and any new buyers will now have more options to them.
I suppose Yamaha are still trying to cater for the organists with the 2 manual version.