As an FYI people are being kicked out of games, we're going to verify all game servers are down, then take down everything. We'll push the patch, you'll be able to update and patch but character/game creation will be unavailable until the reset is complete. We're still estimating it all to be finished by 3:00 PM PDT, but updates will be posted in the Battle.net Status forum on timing.
ed - Change in plan. The patch and realms will be made available at the same time. The patch will not be available earlier as I mentioned previously. We're also looking to be on schedule at the moment.