To be clear: Symless does require a connection to the cloud, but what's sent up is only the locations (IP addresses), machine names, and orientation (relative location of the computers that you arrange in the window) of your environment. Generally, these IPs will not even be routable from outside your private network, so it's pretty "safe" from a security standpoint.
None of your keystrokes, movements, or data (cut-and-paste, etc.) are ever sent to Symless or the cloud. The team is focused on building the automatic configuration at present, since this will serve the largest number of user