You can watch the live stream from Hugo Barra if you want to know more about it:
It's pretty interesting.
By the way, if any of you guys is interested in the $499 price tag, at Geekbuying you can leave your email to have it at that price, or maybe less with a coupon? I'm not sure about that.
Link: http://promotion.geekbuying.com/promotion/xiaomi_mi_drone