I already know Yamaha is replacing the MotifES series with new ones. A larger and full color screen and twice the amount of wave rom. Price will be a little higher.
Yamaha is also coming out with a small, light weight keyboard that will have motif quality sounds and be under $600.00.
Some new low end replacements for their PSR models but no new higher end arrangers until probably June Summer NAMM. PSR3000 and Tyros2 are still current models.