Little did I know... just checked this thread under "What's New At Axiom":

http://www.axiomaudio.com/boards/ubbthreads.php?ubb=showflat&Number=311302#Post311302

Apparently there ARE technical differences between v2 and v3, though mostly depends whether your v2's were produced during the last year of production; if so, they MAY have included the technical upgrades already.