A halloween focused mini-comic is in the works, promising art, back-up stories, and other "rarely seen material". I'd venture to guess that this will be the spot to pick up that Sunset Shimmer back-story announced a while back for those that can't attend comic con.
Anyway, have a description from Newsrama:
My Little Pony: Halloween Edition—HCF 2013 MINI-COMICThanks to Whatshisgame, Masem, and Kein for the heads up! All at once guys! Good job!
(W) Katie Cook (A) Various (CA) Andy Price
Relive some of the most fun moments from IDW's first year of My Little Pony! Featuring amazing Pony art, great back-up stories and other rarely seen material! The perfect treat to pick-up for all ages readers this season!
Mini-Comic, 16pgs, FC FREE