I saw this e-mail last night from 23andMe. You have to log-in to see more details. Basically, it allows you to attach your FamilySearch Family Tree to your 23andMe account.
Display your family tree information
Dear 23andMe Beta Tester,
You’re invited to test our new beta feature! If you have a FamilySearch® Family Tree, you can now upload information about your ancestors to 23andMe and display it to your DNA Relatives and connections.
With this beta feature, it’s now easier for your DNA Relatives to view your family tree information and find shared ancestors. You can also use a new filter to find DNA Relatives who have uploaded their own family tree information.
Learn more about FamilySearch and start exploring.