Yamaha's Winter NAMM '04 website has news on several portable arrangers, including the DGX203, DGX 305, DGX505, PSR1500, PSR3000, PSR293 and the PSR450 as well as some digital instrument news (including the long-awaited mLan interface for the Motif ES) :
http://www.giles.com/yamaha1/pr/trade/NAMM/w04/index.html