After chatting with Paul, I've created a release of the jboss-jacc-api submodule:
which was needed to change the dependency defined in the pom for the servlet API. This version will be used with AS5. When testing the new jboss-javaee release with AS5 org.jboss.javaee:jboss-servlet-api 2.5.0.CR1 is being pulled in from ejb3-core as a transitiive dependency which in the short term will be excluded. Testing continues.
Create an EJBTHREE issue for the dependency. It should be fixed and marked on the banned dependencies list.