2K Australia has confirmed they are shutting down.
A spokesperson shared this statement:
We can confirm we have taken steps to begin the studio closure process for 2K Australia in order to better manage ongoing development costs while improving the working proximity of our creative teams.
We are very grateful for the team’s valuable contributions to numerous 2K projects, and are working with affected staff to explore reassignment opportunities where possible.
The developer is most known for working on the ports for all the Bioshock games on all platforms except Windows, and for developing Borderlands: The Pre-Sequel, this time for all platforms.