The Crystal Skulls

The new Jones film will indeed revolve around the alien phenomenon.
"He protected the power of the divine."
"He saved the cradle of civilization."
"He triumphed over the armies of evil."

The biggest spoiler of the trailer: a shot of a box with the words "Roswell, New Mexico 1947" etched on the side in white paint. Assuming that Lucas has decided to follow the tradition, here, finally, is indisputable evidence as to what the powers of the crystal skulls are. Again deferring to the expert, Dr. Zender posited that one theory on the origin of the crystal skulls was that they were ancient alien "supercomputers," akin to modern-day silicon chips. Indy is now after an even greater weapon — ultimate knowledge - and uniting human/alien consciousness once and for all.