Some speculated that a trilogy set might mean that this is the “complete” series. But trilogy means “complete” about as much as it did with the Star Wars Trilogy. Plus, they have released two movie sets with LWW and PC prior to this. Also, every time there’s been another Harry Potter film released, they release another collection with all of the movies so far. In fact, they’re even doing that with HP1 – HP7.1 this spring, with a complete collection definitely coming after the release of 7.2.
So, that said, does that mean that this is complete? Nope, it doesn’t say “complete” anywhere. That said, we’re still awaiting word of The Silver Chair or The Magician’s Nephew.