Update: It turns out that the wordpad does not use a display at all, it only includes a touch sensor onto which you place regular paper that you write on.
The Royole RoWrite wordpad (RO-F930-A) is an E Ink (~10-inch) powered tablet that includes memory for about 40 notes, and it can transfer these to both iOS and Android devices (via Bluetooth). It seems that the display is 9.7" in size.
The RoWrite will ship in China on December 22, for 799 yuan (about $120).
reMarkable is a "paper tablet", or more precisely a 10.3" 1872 x 1404 E Ink tablet. The display is relatively fast (55 ms) and supports pen input. Other features include 8GB of storage, 512MB of RAM, a 1Ghz ARM A9 CPU, 3,000mAh battery and ePub and PDF file support.
The Onyx Boox Max 13.3 is a large e-reader that uses a 13.3" 1600x1200 (150 PPI) 16-grey scale flexible E Ink display. The Max 13.3 is based on a customized Android 4.0 OS and comes with an electromagnetic pen touch with pressure for natural handwriting input.
The Noteslate Shiro is an E Ink "writing slate" - or an e-reader that accepts input via a pressure-sensitive stylus. The display is a 6.8" 1080x1440 E Ink pearl, and other features include a 1 Ghz CPU, 8GB of storage, microSD slot and Wi-Fi. It runs on Noteslate's own OS.
Noteslate aims to ship the Shiro by February 2016, for $199.