PicketLink has a new feature - Prompt user to select Account at the Service Provider. It has to be mentioned in chapter 3. New Features in part PicketLink Enhancements. To "Major revision of the PicketLink component of JBoss EAP that brings" add point "Dynamic Account Chooser at a Service Provider".
New features topic [30478, rev 640994] has been updated with the new point. The change will appear in the next build of the release notes.
Verified in Revision 6.3.0-5.