So Pete Hines, the VP of Marketing for Bethesda, confirmed on twitter that Nuka World would be the last DLC for Fallout 4. I personally was hoping for a run of DLC next year for the game as well, but we did receive more DLC than what was expected originally.
As for Nuka World itself, it’s an amusement park turned into a Raider City, and you’ll be able to become a raider yourself and conquer your former settlements. That’s pretty badass. We still have the Vault-Tec Workshop DLC that will be coming out this month, and that should keep everyone busy conducting horrible experiments on their Vault Dwellers till Nuka World drops.