The current spec 1.1 will be deprecated in favor of the upcoming 2.0, which will feature YADIS service discovery, security enhancements, anonymous logging capability and XRI (i-name i-number).

[...] OpenID advocates have tried to attract Yahoo and Google for support, but this does not sound feasible because of the business models established on their proprietary single sign-on mechanisms. Wikipedia, however, is expected to support OpenID soon - thanks to a patch created for WikiMedia, the open source wiki software powering the encyclopedia giant.

[...] Even though the system is completely decentralized, OpenID still raises privacy concerns. Some people don't want to have a central place that binds all their accounts. Another criticism is whether the system is fully de-centralized? As always, this space is vulnerable to one provider eventually dominating it. So any disequilibria may put the neutrality of the system under question.