You’ll still have to use actual numbers and letters, but basically, Google has completely loosened the restriction that it received so much backlash on — keeping Google+ full of real identities and names. There’s also a limited number of times you can change names (about three months between changes) as well as no tolerance for impersonating other individuals, famous or not. And finally, anything explicit isn’t allowed, either. Seems pretty fair, all in all.
Of course, this only matters if you actually use Google+, but that post is for another day.
Via: Google Plus