v.55:
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Patch note tells us that a new boss called Mira (or Mila, idk) will appear in Fort Frak. For now you cannot fight her, but you can have her execution minigame in the gallery once you encounter her in the second part of the castle, at the highest floor.
Artebust, the girl we encountered after we completed the underground lab event and threatened to destroy our base if we did not give the item she needed (well she is still going to destroy us even if we give her lol), can be met at the highest floor of the castle. She is also not completed and it is planned to expand her contents.
Some other changes has also been implemented (shop rank I believe), and some future implementations is in the notes, like the actions game in FantasM. Sounds exciting to me if they do the action game.