No idea about expansion launches, but...
There were no queues when ICC launched in December. There was, however, retarded amounts of lag during peak hours but it wasn't just our battlegroup that experienced this crazy lag, so it's hard to pinpoint the exact cause. This lag was happening on both US and EU battlegroups, almost as if Blizzard had pushed some ninja patch with 3.3 that messed things up "behind-the-scenes".
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