Worth watching the full unveiling video[0], wherein they discuss the X-Rays, DNA tests, carbon dating, and other analyses done on the specimens. (Start at 3:32:43 and turn on captions for English translation.)
No idea if this is legit. I am remaining open yet skeptical. If it is a hoax, it's an elaborate one put on in Mexican congress under oath, so I consider it newsworthy for that reason alone. Not sure why the previous post about this was seemingly flagged and removed.