Atlus handled publishing duties for Etrian Odyssey IV in North America, but won’t be responsible for the game in Australia. Instead, NIS America (don’t let the name fool you!) will distribute the 3DS title throughout the continent. That’s according to a rating on the OFLC.
NIS America tends to publish Atlus-related releases in PAL territories. For instance, the company brought Persona 4: Golden to Europe. The OFLC listing probably means that NIS America will release Etrian Odyssey IV in both Australia and Europe.