Interesting. Well, talking about DLC while the game is still in development sounds money hungry as hell.
Well to me it feels like they are just building the hype. I mean, in a corruption game the main part is to see the heroine lose her innocence and become slutty. My guess is, many people are waiting to see the fully corrupted heroine but they don't want to show it because they can keep more people interested this way. If I compare it to other similar games the melvin route can only have 3-4 more scenes at most. Which means they gonna concentrate on the other routes and only do maximum one melvin event per patch.
But maybe I'm completly wrong
This is just my guess