I can't imagine what he's up to, but knowing Mel Gibson it will probably be terrific.
Mel makes great movies about patriotism and courage. Braveheart and The Patriot were two of the best in my book. And who doesn't love Mad Max as fantasy flicks?
2000 years seems a bit extreme unless the Toltec, Omec, etc. civilizations are lumped in with Mayan.
Maybe we will see a reenactment of the ball game though. I'm still not sure of the rules (but I did climb the pyramid and run across the ball court.)