From changelog:

* Support for protocol negotiation eg. SSL/TLSv1 and CredSSP
* Support for CredSSP + Kerberos authentication (NLA)
* Support for smart card single-sign-on
* Support passing smart card pin as password as argument
* Added IPC for controlling a master rdesktop process
* Support for connection sharing when using SeamlessRDP
* Improved handling of network connection failures
* Autoreconnect using the connection cookie at network failure
* Fix a few smart card issues
* Fix bug with mouse scroll handling
* Fix for left/right braces in Italian keymap
* Fix crash and memory leak in local drive redirection
* Fixes issues with license files loading/saving