Yamaha styles are all midi based, which means it is a lot easier to balance styles via the computer.

Yamaha is also making a keyboard from it's previous product line, which is easier to manufacturer.

Audya is just a different product from all others. Balancing audio loops with midi is trickier than all computer generated styles.

As Diki said in this thread and I said over a year ago, sonically you can not beat the realism of a audio loop vs a computer generated style.