Blizzard Entertainment plans to launch Diablo III patch 1.02 today after server maintenance. As the team said yesterday, this patch mainly addresses server fixes. The next patch at a to-be-determined date will focus on class balance.

This is the message displayed in-game at the Diablo III login screen.

We will be performing scheduled maintenance beginning on Tuesday, May 29, at 3:00am PDT to apply patch 1.02 and we expect the service to be available again at approximately 11:00 a.m. PDT. During this time the game will be unavailable for play.