This week's maintenance has been extended - and will be starting at 3:00 AM PDT and lasting until 11:00 AM PDT. Yes, that means additional downtime for all US realms. There's no news as to why maintenance needed to be extended, but if you're thinking this may be a sign of patch deployment, that's highly unlikely. The test realms have always been taken offline before the patch has been deployed on the live realms, and they're currently still up and running. But as to what's actually happening, no one really knows.