It may be anything, but I think it's a little strange how they shot this down so fast without any evidence. Makes me wonder if this is a desperate attempt to deter looters.
http://skeptics.stackexchange.com/questions/32829/has-a-fift...
> Very few Maya constellations have been identified, and even in these cases we do not know how many and which stars exactly composed each constellation. It is thus impossible to check whether there is any correspondence between the stars and the location of Maya cities. In general, since we know of several environmental facts that influenced the location of Maya settlements, the idea correlating them with stars is utterly unlikely.
> In this case, the rectilinear nature of the feature and the secondary vegetation growing back within it are clear signs of a relic milpa. I’d guess its been fallow for 10-15 years. This is obvious to anyone that has spent any time at all in the Maya lowlands.
I think someone should check it out to be sure.