No doubt now that the release date has been <a href="http://diablo.incgamers.com/?p=374077&preview=true" target="_blank">announced</a> you dashed to the store to order. There is a snag at the moment though with pre-orders of the expansion affecting affecting players' live licenses.
We're currently investigating reports from players who have indicated that pre-purchasing the expansion is affecting their live licenses, including for the PTR and Beta. If you have pre-ordered the expansion and have noticed something unusual occurring on your account as a result, please let us know in this thread so I can pass this information on for further investigation.
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Have you pre-ordered and spotted something weird? You can tell Blizzard in the <a href="http://us.battle.net/d3/en/forum/topic/10973427340#5" target="_blank">thread</a>.