Have some spoilers! Enjoy! Here’s the Wired article, here’s the post on Equestria Daily, and here the one on Derpy Hooves News. Yup, that’s it.
Update 2011-12-15 23:33Z: Have a download link.
Update 2011-12-15 23:37Z: Thanks to AYoshiTale for the YouTube upload. [See update 2011-12-22 18:34Z.]
Update 2011-12-17 08:36Z: Another clip has been published on Toonzone. See below, courtesy of psyke7777. (Source: Equestria Daily)
Update 2011-12-17 09:13Z: And have another download link. Way easier this time.
Update 2011-12-17 14:59Z: @HubTVNetwork has tweeted a link to an unlisted video identical to the above: “@MyLittlePony Friendship is Magic starts in just 10 minutes! Can you spot #Derpy in this episode? bit.ly/vjlYZK” (Notice that they called Derpy by her name.)
Update 2011-12-17 16:16Z: Oh yeah, the same on Facebook of course.
Update 2011-12-22 18:34Z: And now thanks to aznjohny for the upload of the first video—because somepony deleted their own video.