From the New York Times:

New evidence from radar surveys by the Mars Reconnaissance Orbiter strongly suggest that the lobes are pure ice in the form of glaciers, buried under a thin layer of soil and rock. If so, there may be an enormous amount of ice on Mars apart from the poles, potentially providing a convenient resource for human missions.

With this much water, I’m sure human life on Mars will became a reality in only a generation or two. Cool.