Starting from the A.A.A.R. v4.0, the new addon for Alfresco Community Edition v5.1 has been released to support the latest community version of Alfresco, today in its third “Early Access” release. As you can see in the compatibility matrix, the compliance is today for A.A.A.R. v4.0 (available for Pentaho 5.4) and A.A.A.R. v4.1 (available soon for Pentaho 6). You can find it downloadable at the link below:
To understand better how the Community Edition is going ahead, with Early Access and Generally Available releases, I suggest to read this blog post from Richard Esplin (Product Manager for Alfresco Community Edition). Have a good read.