NASA’s Mars Science Laboratory mission will study whether the Gale Crater area of Mars has evidence of past and present habitable environments. These studies will be part of a broader examination of past and present processes in the Martian atmosphere and on its surface. The research will use 10 instrument-based science investigations. The mission’s rover, Curiosity, carries the instruments for these investigations and will support their use by providing overland mobility, sample acquisition capabilities, power and communications. The primary mission will last one Mars year (98 weeks).
The initial press release describing the full mission in November 2011 can be downloaded here MSLLaunch
Curiosity has already landed on Mars!