When Will WoD Unlock

So I'm curious. I'm a teacher, and of course I have class on Tuesday. However, I'm not above manipulating my sleep schedule within reason to get some playtime in before going to work. I've been trying to use my google-fu, but have yet to figure out:

When will WoD be available for play (in the US)? Previously they held us to midnight PST given there were race-type achievements. Does anyone know if they're planning on changing it to midnight server time, local time, or anything else since those achievements aren't in WoD?