Great summary of the new Enterprise Portal for AX 2012 built on SharePoint. The author does a comprehensive job here so all I will add is the fact that Microsoft is “eating their own lunch” here by rolling this out to their internal organization, and their employees are excited about it… tells you a lot right there…

Inside Microsoft Dynamics AX 2012: Sharing Business Information the Easy Way w/ Enterprise Portal – Microsoft Dynamics ERP “The Edge” Blog – Community Home – Microsoft Dynamics Community.