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Update contains the content for the Spring Event. There's three new avatars (Dryad, Farmer, Butterfly Collector) earned from the three new achievements. The new flying objects are birds, sheep, and butterflies. There's two new pets to craft = a Spring Cat and a Yellow Bear.
There's yet another Spring room with more than enough items to buy to earn the Furniture Finder achievement. And some of them are rather pricey. And there's two more puzzles.
No new character quests. No doubt the Spring Event Castle Challenge is also in the update, but those avatars won't be revealed until the event starts (probably just days after we finish the current CC.)
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I bought all the available furniture for both games and completed the Furniture Finder achievement. Had to shard a lot of my surplus seasonal inventory.