This is the Celestial Observatory. It's the one you have to craft, see the turtle in Celestia to get the recipe! (And if I know KI and Celestia crafting, there's probably gonna be a whole lot of sunstone) This one looks SO cool! I can't wait to check it out sometime.
This is The Island Gateway, The second one, which you can purchase for gold or crowns. This one (Too me) doesn't look as good as the observatory, but that's just me.
You can read the update notes here!