I did some research and this is a summary:

As of April 2026, the Mad Max saga is at a critical standstill following the underwhelming box office performance of Furiosa. While George Miller has the stories ready, producing a new feature film is not his immediate priority.

Update on Prequels and Sequels (April 2026 Status)

• Mad Max: The Wasteland: This remains the most advanced project. The script is complete and follows Max's journey one year before the events of Fury Road.
• Pivot to TV Series: Due to high production costs and box office risks, reports from late 2025 and early 2026 indicate that Warner Bros. and HBO are exploring the possibility of turning The Wasteland into a high-end television series.
• Tom Hardy's Return: The actor has publicly expressed doubts, suggesting in recent interviews that he does not expect another film to happen anytime soon.

What George Miller is doing now

At 81 years old, Miller has not abandoned the Wasteland, but he has shifted his focus:

• Priority Projects: He has stated that he has two non-Mad Max projects he wishes to complete before returning to direct another installment in the franchise.
• Script Development: He continues to refine the saga's scripts, which he originally wrote as detailed novellas to ensure world-building consistency.

Who will probably take over?

Miller has not officially handed over the director's chair, but the names being most discussed in the industry this year are:

1. Guy Norris: As the longtime action coordinator and second-unit director, he is considered the primary candidate to maintain Miller's unique visual style.
2. Doug Mitchell: Miller’s lifelong producing partner remains the key figure managing the rights and the relationship with the studio.