Daelo has posted that Blizzard has had some technical issues with the testing tonight, and that things are being delayed until they get fixed.
WoW.com has a group assembled and will be going in when the darn things works, and hopefully we'll have some good guides for you in the next couple of days.
Check back for updates on this all. Fingers crossed, we'll bring you good news.
Update: Daelo (Me say Dae-ooo) has canceled the testing for tonight. Check back for later for an updated schedule.