Where there is water there is usually life. From the NASA press release:
…photographs have revealed bright new deposits seen in two gullies on Mars that suggest water carried sediment through them sometime during the past seven years. “These observations give the strongest evidence to date that water still flows occasionally on the surface of Mars,” said Dr. Michael Meyer, lead scientist for NASA’s Mars Exploration Program, Washington…Today’s announcement is the first to reveal newly deposited material apparently carried by fluids after earlier imaging of the same gullies. The two sites are inside craters in the Terra Sirenum and the Centauri Montes regions of southern Mars.