ENTSOG (the European Network of Transmission System Operators for Gas) has published their updated AS4 usage profile:

http://www.entsog.eu/public/uploads/files/publications/Events/2014/INT04...

They conducted a proof-of-concept involving seven end user companies from six countries, using AS4 software from five solution providers:

http://www.entsog.eu/public/uploads/files/publications/Events/2014/ENTSO...

In September they will present this work at a workshop in Brussels:

http://ebxml.xml.org/calendar-event/entsog-as4-workshop