I should have an initial draft of the "High-Availability Guide" finished today. Until then here are a couple resources:
(the section on clustering changes)
https://docs.jboss.org/author/display/AS7/How+do+I+migrate+my+application+from+AS5+or+AS6+to+AS7
http://infinispan.blogspot.com/2011/07/infinispan-in-jboss-as7.html
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