Maintenance goes long to fix "balancing issues," realm splits imminent?

Eyonix posted a short note earlier this evening that tomorrow's maintenance is going a little long-- realms will be offline tomrrow morning at 3AM PST and hopefully back online at 11:00AM PST. The reason for the delay is "a small patch" that's supposed to fix bugs and, here's the important part, "balancing issues."

Now, I'd assume Blizzard would give us more notice than that if there were going to officially split realms. But that "balancing issues" phrase worries me a little bit-- we know that they're ready to take steps (mandatory, if necessary) to make sure overpopulated realms balance their population appropriately.

Adding fuel to the speculatory fire, you'll also note that the realm transfers are only available until... tomorrow morning at 3 AM (right when the maintenance is starting). Could players log on tomorrow with their alts on completely different realms? I guess we'll know by 11 tomorrow morning.

Update: This is just speculation, don't freak out. Sol-El helpfully points out in the comments that Blizzard has previously promised two weeks notice (in-game, too, not just on the message boards) on any mandatory realm splits. Still doesn't explain what "balancing issues" are fixed, but I wouldn't lose any sleep over it.

Update2: Clearly, I was out on a limb by myself last night. The updates have hit, and everyone but me seemed to realize that Blizzard meant class balancing issues, not population balancing issues. Wishful thinking on my part, I guess-- with the way lag and spawn camping are on overpopulated realms, I was almost hoping my characters would appear on a less populated server this morning.