Hi Danny
According to the YPKO forum, Yamaha is introducing a brand new keyboard at the upcoming Pakefield Festival in September, however whether this is a T3 replacement is unknown.

Adding Audio Styles does not mean getting rid of the old style system. (The Audya has both so as to maintain compatibility with styles from earlier instruments)

Each instrument has a characteristic sound, and if you play the same sound style on different instruments they will always sound different, (A Yamaha Piano sounds different to a Steinway Piano even if you play it the same) if they didn’t there would not be any point in making them.

Personal preference will determine what is best for you.

Bill