What is budikai 4?

As an AI language model, I don't have current information about Budikai 4 (also known as Dragon Ball Z: Budokai 4) as the game hasn't been officially announced by its developer, Bandai Namco Entertainment. It is worth mentioning that the last major Dragon Ball Z fighting game released by Bandai Namco Entertainment was Dragon Ball FighterZ, which was released in 2018 for PC, PlayStation 4, Xbox One, and Nintendo Switch. However, rumors and speculation suggest that the next installment of the Dragon Ball Z: Budokai series could be in development for next-generation consoles such as PlayStation 5 and Xbox Series X. As a language model, I don't have access to future game release information before it is officially announced.