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I've seen other Mars Rover photos that show what looks like rocks under a sheet of water ice. Mars can get up to 20 degrees C during the day which may be enough to thaw ice in rocks at the surface. It is strange how all the boulders, rocks and pebbles in some shots have smooth areas of soil around their bases. This looks consistent with water erosion, as if a small puddle had existed around the base of the rock and evaporated off.
There was an article in the May/June edition of Australian Sky & telescope magazine where a couple of scientists have shown how it may be possible for water to exist for longer periods than previously thought.
There is enough atmosphere on Mars for winds, since it is these dust storms that clean the solar pannels on the rovers.
Just because NASA don't have anything on their website doesn't mean that there's nothing in it. There are mountains of data and images to study from the rovers. NASA may not have released anything because they are being cautious about making any definite statements until they are sure.
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