The 8107 update will improve the proximity sensor and Gmail contact sync as well as correct problems with visual voicemail, Microsoft security and the Arizona time zone.
You should receive a pop-up message alerting you of the update or you can connect to your Zune desktop client and check for the update under the phone's settings. The update will bump your software version to v7.10.8107.79. Let us know in the comments if you've gotten the update and any additional tweaks it may hold.
Dare we hope that AT&T's update will be next?