EDIT: SERVER IS NOW UP!
Looks like we are going to have to wait just a bit longer to get a crack at the Infernal Machine and other new features.
Blizzard Quote [source]
We're extending maintenance for the Americas region by 2 hours and now anticipate that all game services will be available by approximately 3:00 p.m. PDT.
The latest client patch notes can be found here.
An updated known issues list for 1.0.5 is available here.
If you are experiencing technical issues with the patching process, please visit our support site for assistance.
We will be performing scheduled maintenance for Diablo III starting tomorrow at 3:00 a.m. PDT in order to deploy patch 1.0.5. We anticipate that maintenance will conclude and that all services will be available by approximately 1:00 p.m. PDT.
Important: Please note that you will not be prompted to download patch 1.0.5 until the patch is live in your home region. If you are logging in from a European or Asian client, you will need to wait for this patch to release in that region before it can be installed. Additionally, if your home region is the Americas, you will be unable to log into Europe or Asia using Global Play after patch 1.0.5 is live until those regions have also patched.