The DR800SG includes a pouch at $399, which isn't as useful as a cover (particularly since the required Wacom pen is stored with the pouch).
Note that lBook was estimating $325-330 for the A9 (
First readers with SiPix screens announced).
There are going to be lots of SiPix-based devices, but at least initially vendors like Jinke with an existing track record with ebook Readers will likely have a distinct advantage in software robustness. The touch screen and WiFi are new areas for Jinke though.