Blizzard announced a Two-Day Time Extension today after issues with the patch release last week. For full details read please read the news article from Blizzard, quoted below.
Two-Day Time Extension
The patch released last Tuesday contained many new features, content, and improvements to World of Warcraft. However, the new patch also contained a few small bugs which caused interruptions in play time for some users. These bugs were quickly identified, and most of them were hotfixed last week. We plan on implementing fixes for the remaining bugs in tomorrow's maintenance.
Our team continues to work hard to provide our players with the best play experience possible, and we realize that extended, unscheduled downtime is frustrating. Therefore, all World of Warcraft players will receive a two-day time extension for the downtime caused by last week's patch. This extension will be added to players' accounts early this week. We apologize for any inconvenience, and we once again wish you all good luck in your adventures in Azeroth!