For easier reference next time:
http://scn.sap.com/community/process-orchestration/blog/2015/11/06/what-s-new-in-sap-process-orchestration-75-sp00
http://scn.sap.com/community/process-orchestration/blog/2015/07/10/what-s-new-in-sap-process-orchestration-731-sp16-74-sp11
http://scn.sap.com/community/process-orchestration/blog/2015/04/13/what-s-new-in-sap-process-orchestration-731-sp15-74-sp10
http://scn.sap.com/community/process-orchestration/blog/2015/02/02/what-s-new-in-sap-process-orchestration-731-sp14-74-sp09
http://scn.sap.com/community/process-orchestration/blog/2014/12/18/what-s-new-in-sap-process-orchestration-731-sp13-74-sp08
http://scn.sap.com/community/process-orchestration/blog/2014/08/04/whats-new-in-sap-process-orchestration-731-sp12-74-sp07
http://scn.sap.com/community/process-orchestration/blog/2014/03/31/whats-new-in-sap-process-orchestration–q12014-731-sp1011-74-sp0506
http://scn.sap.com/community/process-orchestration/blog/2013/12/02/whats-new-in-process-orchestration-731-sp0974-sp04
http://scn.sap.com/community/process-orchestration/blog/2013/08/16/whats-new-in-process-orchestration-731-sp0874-sp03
http://scn.sap.com/community/process-orchestration/blog/2013/06/14/sp7-of-sap-netweaver-process-orchestration-731
http://scn.sap.com/community/process-orchestration/blog/2013/03/19/sp6-of-sap-netweaver-process-orchestration-731–what-is-new
http://scn.sap.com/community/bpm/blog/2012/11/05/whats-new-in-netweaver-bpm-731-sp05
Collection of What's new in SAP Process Orchestration