I was not impressed with the Sipix screens that i saw. Jinke had them of course and I also saw a reference model at the Marvell booth. The contrast was not as good as the e-ink displays.
I did find at CES that 2 companies- HTC and HP have stylus that work with their Capacitive touch devices. That is definitively a plus for this epd's going forward. If you can do touch with astylus cheaper than Wacom but without the layer over top of the display - its pretty much a win