Right on schedule, Blizzard has launched the rather significant 2.1.0 patch for Diablo 3: Reaper of Souls on its North American servers, introducing its new seasons concept as well as greater rifts, leaderboards, itemisation updates and new environments.
A blog post discussing everything can be found here
on the battle.net site. As Australian players default to North American servers, you can update right now, but if wanting to Global Play on the European or Asian servers, you might have to wait until those patch.
Watch the overview video below.