I noticed that Yamaha did not post info on their Messe Site about the S700 or S900 and shot off an email inquire. I got back a response very quickly that said:
"there is no information available now for new PSR and CVP models..
Yamaha has decided to release web infomations about some new products only close to the product launch in later spring."
So I guess we will need to wait a bit for official news.