I am just logging on for the morning and catching up, but the latest update I have is that servers should be up in approximately 45 minutes from now.
As the posts say, there were unexpected issues that came up with the build, which delayed the patch. Late last night it was called out that a maintenance would still be needed in order to prevent additional server issues from spinning up. This is obviously not ideal, but the unexpected issue with the original patch caused a lot of changes to come in late after working hours.