The venerable Nexus One is still receiving updates directly from Google. While we are not sure what this updated version of Gingerbread does for the Nexus One, Google does say that it has "important bug fixes and security patches." I can report that immediately after I manually updated my phone I did notice something on my N1 that I had never seen before. When I turned on my Bluetooth device, the BlueAnt T1, I noticed a notification on my taskbar informing me that my Bluetooth was requesting permission to connect with my phone. I noticed that my Bluetooth was not connecting so a pulled down the notification, clicked it, and it asked me for permission to accept the connection. I turned off my Bluetooth and turned it back on and I did not get this notification and my Bluetooth connected to my phone normally. I will update you on any new features or issues that I may notice with this new version of Gingerbread.
The Build Number is GRK39F. If you do a Google search for this Build Number you will find many download locations. Just download the zip file, rename it update or update.zip, install it to your SD card and reboot the phone just like with past manual updates. If you want detailed instructions on how to manually update let me know and I will email you step-by-step instructions. If you don't want to go through the process of manually updating your phone, just wait and you should be getting an OTA update directly from Google in the coming weeks.