Fallen Star, the third booster pack released for Warhawk, was released on August 28, 2008. It included the Tau Crater Map and the Icarus MK-1 Rocket Pack. The Icarus is a jetpack that can be picked up at various bases and can be used to fly as a troop.
A description of Fallen Star, along with relevant screenshots, can be found here at Sony's playstation.com blog.
The free 1.5 patch MUST be installed before installing Fallen Star (see Sony support article here).