Blizzard announced that purchasing tickets from partner theaters you get the base game for free.
Members of the Regal crown club (whatever it's called) has a chance of 2 blizzcon tickets.
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I did for years after one of my deployments had me hooked on it when playing it at a deployed contractors home. I played from near the end of Vanilla all the way until Deathwing, and after a small break came back to try out MoP. The game is incredibly fun with friends, but it will easily turn into a job if you let it. It's also frustrating trying to get everyone on the same timeline to raid and even more frustrating when people take smoke breaks between every pull.