Samsung's Global Download Centre had listing for the unreleased NX20 and NX1 cameras. Those model names are now removed. The Samsung NX1 is expected to be announced in 2012 and will probably be the top of the line NX camera. Few months ago there were rumors about a new prototype camera called R1 with the following specs:
The Samsung NX20 is expected to be announced at CES 2012. The new camera is rumored to have electronic shutter.
There were even some speculations that Samsung may be working a medium format digital camera.