I dunno. Maybe it is me.. but things are funny how Sony in about a year's time will release a new model. BUT hold on? what about the "current" model?
There is still room for improvement? How about investing some R&D to your current customer base?
I would love to see some improvements to the current firmware.

Features I would love to see:
1. press info button and see metadata about the book, and its cover.
2. Option to rotate book covers for screen savers?
Anything else?
I have owned the 600 and now the 350.. though the 600 was good it suffered the glare so the 350 is faster and smaller but way better screen.. the UI needs some improvements ...
I guess all the Sony Staff is focused on the next big thing.. what about the current installed customer base?