Blizzard has announced in its official forum that the 1.04 update for Diablo III goes live later today, as servers will be going down to prep for it.
According to the post, the maintenance will vary according to region:
* The Americas: 3:00 a.m. PDT to 1:00 p.m. PDT (8/21)
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Europe: 8:00 p.m. PDT (8/21) to 6:00 a.m. PDT (8/22)
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Asia: 11:00 a.m. PDT to 11:00 p.m. PDT (8/22)
The gameplay fixes and additions are listed here, while the class tweaks can be found here. The most significant update, of course, is the Paragon System.
Those of you who install the update, let us know what you think of the changes.