I can only see a couple of possible outcomes:
- Hello Games are being silent to allow the controversy to blow over, and the next time we hear from them will be to announce they are working on something new.
- They are working on an extensive expansion/repackage (basically think Final Fantasy: A Realm Reborn), in the hopes of salvaging what worked from the vanilla release, and developing it closer to their original vision for the game. (this would not be just DLC though, it would be a way to try and relaunch interest in the game).
Realistically, I think it is a case of them moving on. Despite them selling a shit ton of copies, I think the well has been poisoned by the critical reaction towards the game, and most players have probably moved on. Further developing the game could just be throwing money away, especially if it is small scale DLC.