MLP comic #17 HATH ARRIVED. Time to delve into GLORIOUS pony history! Celestia and Starswirl did some things. What things are those? Go read the comic!
Have some links (Thanks to Ace Reporter Illustrious Q for the diggin!):
Digital:
Comixology
iTunes
Variants:
Cover A
Cover B
Cover C
Hot Topic (AKA Best cover AKA Trixie)
Larrys Comics 1/2/3
Physical:
Go use the store locator!
Seriously go read this one. It's ramping up to be something really cool!