Personally, I'm not sure what Sony can bring to the PRS line that I actually need (speaking from owning a PRS-350). I already think the interface is really good, there are no new screens (at least from eInk, none that I know of) that Sony can use. The only thing basically, in my mind, that they can do is redo the OS and interface and use a faster processor (and wifi...), which would not make me let go of my PRS-350...
But...
I *am* curious