We're got a little bit of new information on the first Equestria Girls short! Apparently it will be airing in Poland on May 14, meaning (hopefully) that it should be airing somewhere around the same time in the US I would assume!
Get the rest of the details such as run time and title after the break!
Thanks to Robert for sending it in!
Run time is at 22 minutes so about the same length of a normal pony episode and the title of the special translates to 'Dance Magic'.
Source
Twitter: Calpain