Um there was maintenance this week - longer than normal actually. Where were you for that one?
And 8 hours ago....http://us.battle.net/wow/en/forum/to...1184?page=4#61
I remember opening the portal for BC was smooth. I remember turning on the portals to Northrend being smooth.
The only trick, at least for BC, was logging out and back in before you could port to Outland. I'm not sure if the same was true for Northrend, although I was doing it anyway. Either way, there's no maintenance period planned for midnight, it's just a command we run on all the servers, and assuming your account is upgraded, shazam, everything opens up.