The OS is listed as being 'Peekux' but this sounds suspiciously like Linux. I wouldn't be at all surprised if it's actually Linux, modified for a single task. Only Linux would be able to run on such a small device with only 8MB of RAM. I wonder if they will count this as a smartphone win for Linux and add it to Linux's marketshare.
People who use this thing will probably never know it's Linux, 'it just works.'