You can access the new boss by talking to her in the hub area and clicking "About the challenges...". It's meant to be a 2nd tutorial before Louise, so try beating her off first before beating off to Louise.
Some known issues:
- Settings -> Invert Horizontal Look is duplicated, this is only a text bug. The top invert is for vertical and the 2nd is for horizontal.
- Keyboard and controller remap menus haven't been designed yet, so it's still using a placeholder.