Ben Fried said that Google Domains will offer all existing gTLDs, as many as possible New gTLDs and ccTLDs (2 so far). The system is not yet feature complete and still in beta. They will get feedback in the next couple of months and will build all the features of domain registration in one price.
Read the article here: http://onlinedomain.com/2014/07/01/news/who-cares-about-new-domain-names-google-does-and-you-should-too/.
But you can already register all new domain names with the World's Largest Registrar - GoDaddy.com