Saints Row 4 launches on 20th August 2013 in the US and 23rd August 2013 everywhere else, a just-published trailer reveals.

Saints Row 4 is planned for release on PC, PlayStation 3 and Xbox 360, and is made by series developer Volition.

It's published by Deep Silver, which bought the Saints Row intellectual property and Volition after previous owner THQ went bust.

From the official blurb:

In the next open-world installment of Saints Row, Deep Silver Volition continues the story of the Third Street Saints by elevating their status to the highest level - the leaders of the free world. In Saints Row IV, the head honcho of the Saints has been elected to the Presidency of the United States. But the Saints are just getting started. Now the larger-than-life insanity of the Saints series gets a new twist with a catastrophic alien invasion, and the aliens have transported the Saints to a bizarro-Steelport simulation. Wield gargantuan superpowers and fight to free humanity from alien granddaddy Zinyak's mental grasp. Escape the simulation that's trapped the Saints crew, or die trying. Saints Row IV lets players delve into an arsenal of alien weaponry and technology that will turn each Saint into an ultimate entity of destruction. Utilize out-of-this-world superpowers to fight all the way to the top. With intensified action and enhanced customization, players can use their newfound superpowers and leap over buildings, outrun the fastest sports cars, or send enemies flying with telekinesis in the greatest, most insane installment of Saints Row yet.