Ever alert Steve G1KQH has spotted that Yaesu launched the new FT991 at the Tokyo Ham Fair in Japan as a replacement for the FT897D. See http://qrznow.com/yaesu-ft-
This looks a very neat, small, multi-band, multi-frequency rig, as long as the price is sensible. In Jaoan, they usually sell a QRP version too. It would be good to see a 20-30W version in Europe too. This would compete well with the (now stopped) IC703 rig by ICOM.
The image is linked from the http://qrznow.com/yaesu-ft-
There is no sign of a replacement for the FT817ND rig. I think Yaesu must have abandoned plans, which is a shame.