Where is information on the workflow changes delivered in R13 - patchset 19B?

Patchset 19B was recently installed in our non-production environments.    We are finding subtle differences in workflow terminology.  

Example:  for requisition approvals, the ad-hoc action is no longer labeled ad-hoc, but is now labeled 'route task'.    For expense approvals, the ad-hoc action is still labeled ad-hoc.

The functionality for route task appears consistent with the ad-hoc.     We did not find information in the release notes that identifies this change.  

Does anyone know where we can find information on what all was changed (in workflow) in R13 - patchset 19B?     We did not find anything in the release note documentation.