Here is the latest from the guys over on the Age of Sigmar Facebook showing off all the Gryph-Beasts, including one model not yet released.. although its for Blood Bowl
via Age of Sigmar Facebook
https://www.facebook.com/GWWarhammerAgeofSigmar
These avian-headed hunters of the realms are all available to order and pre-order now (except Griff, but he'll be along soon)