It might be of interest that this newly-found "reference to 2012" aka end of the Mayan calendar -- actually reinforces continuity and stability of an existing historical saga, and is opposed to a cataclysmic end-period.
For those who have not read the OP article, here are the concluding paragraphs. I bolded the last one for emphasis.
While deciphering these new finds in May, Stuart recognized the 2012 reference on a stairway block bearing 56 delicately carved hieroglyphs. It commemorated a royal visit to La Corona in AD 696 by the most powerful Maya ruler of that time, Yuknoom Yich'aak K'ahk' of Calakmul, only a few months after his defeat by long-standing rival Tikal in AD 695. Thought by scholars to have been killed in this battle, this ruler was visiting allies and allaying their fears after his defeat.
"This was a time of great political turmoil in the Maya region and this king felt compelled to allude to a larger cycle of time that happens to end in 2012," says Stuart.
So, rather than prophesy, the 2012 reference places this king's troubled reign and accomplishments into a larger cosmological framework.
"In times of crisis, the ancient Maya used their calendar to promote continuity and stability rather than predict apocalypse," says Canuto.