They specifically list it as an accessory from the Phantom 4 product page and it says in multiple places in the description that's it's compatible with both the 3 and 4.
Anyone know if this is true? I thought that cases for the 3 generally didn't fit the 4 without modification? Has someone retooled one so it does?
B&H is also taking pre-orders on a DJI hard shell case that claims to be for the 3 & 4.