Sometimes updates don't include new scenes, especially when we're talking Alpha > Beta > Final. It includes fixed code, new lines of dialogue, changes to existing dialogue. Sometimes Eva even goes back to very early in the game and makes changes there so that a new development added in a more recent chapter has some level of set up.
I know we're all a bunch of filthy degenerates here, except for
ffive , but one of the things that makes Eva's games so good is that attention to detail to other aspects of the story besides just the sex scenes.
And let me say this, there as been a lot added to early game as far as dialogue and how choices affect stats of Lena and Ian, as well as their friendship points with other characters. If you're only playing the latest updates from where the last update left off, you're doing yourselves a disservice.