Today is not just any maintenance Tuesday. Today is the mega-maintenance day in which Blizzard will be performing maintenance on select realms for at least 24-hours. While they don’t tell us these things, one can only assume they’re performing hardward replacement and network upgrades, along with the normal maintenance that happens on Tuesday. Blizzard performed similar maintenance prior to Burning Crusade and as far as we know haven’t significantly upgraded the servers since. I’m simultaneously happy my realm isn’t on the current list to be upgraded today, and dreading the fact that that day is coming in the future because 24-hours is a very long down time and Tuesday is a prime raiding night for us.