I have a couple of thoughts after doing this demo:
Wildfly Swarm generator  allows to add Infinispan integration module. Unfortunately it doesn't provide Infinispan classes to the classpath (one needs to add infinispan-core in provided scope for example). I created JIRA to fix this .
We should probably make JPA (Hibernate) an optional dependency. Created JIRA for it .
Injecting beans into JAX-RS classes require using org.wildfly.swarm:jaxrs-cdi. This will be addressed at WF Swarm side .
I must admit, implementing this demo was a really nice experience (there were some problems, but with Martin's and Tomas' help I managed to work them out (thanks a lot guys!)).
If you have some time, please experiment with the demo code and tell me what you think. If there won't be any comments, I plan to write a small blog entry about WF Swarm and Infinispan.