The British actor, whose latest film Lawless recently premiered at the Cannes Film Festival, told Empire that he is still waiting for George Miller's Mad Max: Fury Road to confirm filming dates.
"We keep moving that around, you know?" he said. "Who knows when it'll come out? I've been on standby for two years... but it's all part of it. It's kind of the cool thing to do, to be elusive with dates and all that."
Asked what the sequel's storyline would entail, Hardy joked: "It's a musical - we're going to go around shopping centres in a little wagon and sing songs. People were expecting big, but we're going to give them small. It'll be a live, free-running musical and it's coming to a place near you soon."
Director Miller told Digital Spy last year that he had planned to shoot the fourth Mad Max instalment in Namibia early this year.
The Australian filmmaker wants to utilise custom-made cameras to shoot the action movie in 3D.
Charlize Theron, Nicholas Hoult and Zoe Kravitz were attached to star in Mad Max: Fury Road when it was announced in 2009.
Photo gallery - Tom Hardy at the Lawless Cannes premiere:
Copyright: Lionel Cironneau/AP/Press Association Images