I shall answer this right now. No, this in not all new comic book material. Amazon.com has listed a trade paperback—once again a few months before it's official solicitation from IDW—collecting the now fairly hard to find 2013 MLP Annual and the 2014 Holiday Special.
You know, all the currently released Equestria Girls comic material.
But for those who might have missed out on picking up those comics, you now have a perfect opportunity to do so.
You can pre-order the trade paperback from Amazon.com here!
Twitter: The Illustrious Q