The version in the EE 7 deployment (and other) descriptor files might need to (or should) be updated for Java EE 7 support.
Some that comes to mind are:
DSS-1926: application.xml DSS-1928: web.xml:s DSS-1927: persistence.xml and entity-mappings (orm)
- [-] jboss-app.xml: no version in the file so should be ok
- [-] jboss-deployment-structure.xml: Could be upgraded but does not seem to be needed
- [-] jboss.xml:s: No version in the file so should be ok
- [-] jboss-webservices.xml:s: Let's keep this for now unless needed to change
- [-] sun-ejb-jar.xml:s: Let's keep this for now unless needed to change