The domain name is still google.com. I'm pretty sure this is an april fool's joke.
It would've been funny if they changed Topeka on Topeka Maps to Google.
Topeka, some city, decided to change it's name to Google. So now some people live in Google. Besides that, Google decided to honor them by changing there name to Topeka. :D
Yes. The capital of Kansas changed it's name to Google on April 1st, and vice versa. >.>Or maybe they did for real. I think it was for the lols, though.