Moved to JSF forum where you might some help.
Seemed to be related to https://issues.jboss.org/browse/JBSEAM-4637
I had to do the following:
1. Remove jsf-facelets.jar from the deployed WAR.
2. Set the faces-config.xml version to 2.0
3. Remove the (JSF 1.2) reference to <view-handler>com.sun.facelets.FaceletViewHandler</view-handler> from faces-config.xml
After these it worked "as expected". (You also have to use richfaces-impl-jsf2.jar, see http://community.jboss.org/wiki/HowToAddRichFaces33xToMavenBasedProject)