Each season will have three parts. Including the introduction, it will be 13 chapters.
Spring: Fluttershy sees Big Macintosh bucking apples one day, and can't possibly get him out of her head.
Summer: Sea Spray finds himself in Ponyville with a broken wing, and must stay at a house with Lyra and Bon Bon.
Autumn: A human who dies before his time is given another chance to start over in Equestria, finding a charming young wall-eyed mare.
Winter: Gilda the griffin is insulted out of Ponyville, where she is found and befriended by Alkaline Grey, forcing her to re-think her place in the world.
Heavily inspired by the "Griffin Village" album by Jackle App. This is what I think of every time I listen to them.
Thanks to Jackle App for giving the go-ahead, and thanks to Pandykissu for the awesome cover art!
To those who don't feel like reading, there's also a Fanfic Reading by Lucero the Pegasus that I found just now.