You have always been able to list surnames in your profile. Many a match has written to me that we can't be related because they don't recognize any surnames in my profile, and then cut off contact. This is rather silly, especially when the person has only researched one or two generations of their own tree. If everyone knew every ancestral surname on every line for the past 500 years, then genealogical research and DNA studies would not need to exist.
The next feature is a map with locations of your genetic cousins marked in purple.
Map of matches of my father
Map of matches of my mother
Locations in the United States of my mother's closest matches
So onward to the next new feature: shared surnames among the matches.
Shared surnames among genetic matches for my mother
Shared surnames among genetic matches of my maternal uncle
I turned to my father's common surname list next, putting my extensive research to the test.
Shared surnames among genetic matches of my father
These new genealogy tools will be useful and are a welcome addition at 23andMe.