Two pieces of news from Blizzard today:

Patch 1.4.2 Released!
A new, minor patch has been released to address a crash issue in 1.4.1. There will be no downtime to apply this patch, and players can begin playing as soon as their version of World of Warcraft has been updated. We greatly appreciate your patience during the time it took to get this patch to you. Thank you for bearing with us!