There isn't an actual image for the cover available yet, but Midtown Comics is promising a muffin eating grey pegasus on their exclusive version of he comic.
It's pretty pricy at a regular 10.00 (On sale for 8.50 currently), but I guess that's how promos roll right? Head on over to this page to pre-order it. The release date is 11/14.
Thanks to Joseph for the heads up!