Yep, OpenID will be supported around the same time as Facebook connect. You certainly will be able to link your OpenID account as well as your Facebook account.

Google Apps will act as an OpenID provider

OIX is not to be confused with OpenID, which is a standard that lets sites such as Google, Twitter or Facebook share the same login credentials. U.S. Government sites require a trust framework, a certification system that enables a party who accepts a digital identity credential to trust the identity, security and privacy policies of the party who issues the credential. OIX is the first Open Identity Trust Framework provider, enabling certified sites to share their login credentials with U.S. Government sites.

hmm the email argument - yuk!