The console edition of the action-RPG was originally announced for the PS3 and PS4 back in February. However, a month later it emerged Diablo 3 on consoles wasn't necessarily Sony-exclusive, and sure enough Blizzard announced the Xbox 360 version this morning.
Blizzard says both the Xbox 360 and PS3 versions include all the "major content and design updates" made to the original PC game, which was released last summer. Also, pre-orders on both platforms receive the 'Infernal Helm' in-game item.
Update: When asked if Diablo 3 is coming to the Xbox One, a Blizzard spokesperson told Joystiq, "We're excited for console players to get their hands on Diablo 3, but we don't have any further platform announcements to share at this time."