I don't plan to take any time off to coincide with the release of WotLK. There's nothing worse than taking a few days off and spending them trying to troubleshoot installation/upgrade problems, trying to stay logged on as the login servers melt under load, and trying to work my way through clogged zones on a PvP server (where there is guaranteed to be a dozen or two members of each faction deliberately running around ganking people for hours, making it impossible to do much more than read and accept a few quests).

I might take some days off once things are settled down and if I feel it would be a good way to spend a couple of days (never hurts to take some time off from the work grind).