I would really like to not see google products used on an anonymous coin.
Google Authenticator uses a standard protocol for 2FA. Neither the server nor the client needs to communicate with Google for Google Authenticator to work. This will definitely be supported in the new forum. (And maybe also added to the current forum.)
Finally, a confirmation on 2FA, this is awesome(thanks theymos). But the possibility of it being implemented on the current forum software makes me wonder about just how long will take for the new forum software to roll out.