Every year they generally cycle through new rewards for the seasonal events.

Last year it was:
Mini-game
Cute Story
Housing Items
Glamour (Choir Robe)
Orchestrion Roll

This year it's
1&2
Chocobo Barding
Housing Items
Orchestrion Roll


Two years before it was very similar but it was a mount you got as a reward.

Most likely it'll be an emote next year or another mount. So you never know.