not sure if anyone still cannot buy it after it's available in B&H, but just FYI, there are plenty dpt-s1 availabe on world.taobao.com, some shipping from Japan others from China, including the rooted version like this:
http://world.taobao.com/item/5226465....fSAdVY#detail
PocketBook last time said they would release the CAD reader in Oct 2015, now it's Nov 2015 but no news, while Onyx just posted they are working on one too, expected to release in 2016:
http://www.weibo.com/onyxinternational