I didn't see a topic on this yet for the X so might as well get it going.
Found this one from Tesla on my FB page. http://cnettv.cnet.com/tesla-model-x/9742-1_53-50119782.html
Video of a short first drive in Model X including footage from the doors closing while sitting inside:
In another thread by DROdio there is some nice footage from inside a showroom with Model X present: