Hello Sunny
The SD 2 was at the Blackpool Keyboard Festival, and the UK confirmed price was �279.
The sound engine is the same as SD 5, and most of the same voices are available, however please be aware that apart from the connections and a volume control, there are no other controls on it, so make sure your keyboard has a comprehensive Midi output, that will enable you to control it to the full.
As soon as it is available, I am sure the instruction book will be available on the Ketron (Italy) site.
Hope this helps.

Bill