I have seen that Martin Bergljung has published some blog posts.
They are hidden currently in his personal blog and it is not visible on the Alfresco ECM place.
If you do not follow Martin, you will not get any hint about these posts!!
Currently the BPM menu entry links to an external site.
Maybe it would make sense to create a new place for Alfresco Activiti related questions, especially the one for the enterprise edition??