The US dealer released a new firmware - I think they are selling Arta Tech models.
http://www.onyxboox.com/images/update-20130315.zip
Unfortunately, I tried to update to this firmware, but with no luck (reboots immediately after checking for updates).
PS: not onyx-boox but onyxboox.
PS2: The firmware version of this recently purchased device is 1.8 20121224. So the Arta Tech models already got v1.8 firmware (hmmm, I am a little disappointed b/c I expected more fancy features

). Anyway, I think this Arta Tech model is good, and I like the TTS and Dropbox access.