Credit for the translation of these tweets goes to ReadingSteiner:

First one:

We’re developing a new port of Oc;9. In the new version, there are plans to add more hints and elements that’ll unlock a True End scenario set after the final ending. Everyone that already owns the game on the other platforms will be given this content in a free update patch.

Second one:

Occultic;Nine is a story that looks at the ‘meaning of life’ and the ‘meaning of death’ from a scientific point of view. But it isn’t over… Indeed, this story will take us back to the Science Adventure series. After all… just who was it on the other end of Moritsuka’s phone?