If you're sitting around waiting for the servers to come up, you have a bit longer to wait - the roll out of patch 6.0.3 is continuing apace, and the servers will be down for a while longer
This is apparently due to last minute issues
with the new patch, so it may or may not be the final say in terms of delays. Don't get too overexcited either way - things could end up resolved earlier than expected, or they could be delayed past 1pm Pacific. Just know that currently the call is that maintenance has been extended past the 11am PST point.
Updated - Server Maintenance has been extended until 4pm PST