Another book has popped up on Amazon. There isn't a cover yet, and it only clocks in at 25 pages, but it's a thing we can expect for way out in January of next year. The description hints at Winter Wrap Up:
Description: Join Twilight Sparkle, Pinkie Pie, and the rest of the ponies as they celebrate the beginning of spring! It's time to clear away the clouds, plant flower seeds, and wake up hibernating critters. Illustrated with charming stills from the hit TV show, My Little Pony: Friendship is Magic!You can find it over here!
Thanks to Velin for the heads up!