For those ships, "The Haven" was primarily just a name change from "The Courtyard" although they did add some new perks such as 24 hour butler service. The Haven will have a unique identity on the two Project Breakaway ships and will truly be different than on the older ships.
Norwegian gets high praise for their suites and the special treatment suite guests receive. Perhaps more so than any other mainstream cruise line, Norwegian has essentially reintroduced a class system where those in suites are 1st class in many ways. Not that I have a problem with that.