Kotaku reports that any future content for the game will now be handled by Sony's internal suite of development talent. A Sony rep sent the following statement to the outlet:
Sony Computer Entertainment can confirm that the working agreement with developer SuperBot Entertainment has amicably ended. We have had a positive working relationship with this talented studio, and wish them the best of success in their next endeavor. PlayStation All-Stars: Battle Royale and the title's forthcoming DLC releases will continue to be fully supported by Santa Monica Studio.
The outlet goes on to claim that one source has said that because of this, SuperBot will be forced to close its doors. The situation for the development team certainly doesn't look all too promising at the moment.