Ten Ton Hammer is reporting that there is a recent Server Optimization update:

So we're all obviously tired of the Additional Instances Cannot be Launched deal. Blizzard has said they're working on it, and we got a new wave of servers upgraded. You can check out the full list over on the forums here. Hopefully this'll make Heroics a little bit more popular to give those of us who enjoy grouping more than anything some entertainment when not raiding. Hopefully your server is on the list, or joins it soon!