The teardowns never lie! You know how we've been telling you the Play Store is getting a Wishlist feature? It's rolling out now on a per-account basis. You don't have to download anything, everything is already built into 3.9.16. Wishlists are basically a bookmark feature, which lets you save a list of apps.
We've got pictures!
Once your account gets enabled, go to any app page on the Play Store, and you'll see the new Wishlist icon in the top right.