I recently went on the CMS website and tried to attest for MU for 2014 but it won't accept certifications using the 2011 criteria. Those of us using AC V6 are supposed to be able to do so.
I found out from Bradley Smith at AC tech support that "From what I understand, CMS has to do an update to their website in order for it to accept the 2011 certification numbers. I have heard that this update will take place around mid-October. I think they are waiting for the Medicare 1st year providers to attest since there will be an abundant amount of demand to their website on October 1st."