Raffle models - Show Jumping Warmblood, head-down Make a Wish
Diorama contest prize: Stud Spider
Live show glossy prizes: Paint Me a Pepto, Hwin
Live show reserve grand: Wyatt
Live show grand: Adios
Custom contest grand prize: alternate color 2017 Premier model, probably True North
Custom contest runners-up Stablemates: alternate colors of 2017 Stablemate Club models
Costume contest prize: glossy Nazruddin (not much mystery there)
1-Day Stablemates: Django, G4 Driving Horse, G2 Warmblood, G2 Thoroughbred
Volunteer Model: Croi, since they seem to be using her a lot lately
Crystal horse: Carltonlima Emma
Pop-up Tent Classic: Polo Pony
More-different (decorator) Pop-up Tent Classic: Harper
Pop-up Tent Stablemate: G2 Rearing Arabian
Looks like a blue roan Bluegrass Bandit to me. I'll hold off on more commentary on that until the model is officially revealed. I'm not going to predict other store specials, because they're usually based on guest horses, there isn't always more than one, and there isn't really any way to predict what they'll be ahead of time.
So, those are all I can think of for now - hopefully I got at least a few of them right, though we'll have to wait until Breyerfest itself to see what some of them are. It's going to be a long five months, but worth the wait, I hope!
2/8/2017: Edited to update my prediction for the Classics in the tent. Can't believe I forgot about the Polo Pony!