NY Times(reg. req.): Computers Join Actors in Hybrids On Screen:
"The film, with a budget of about $200 million, is an original science fiction story that will be shown in 3D even in conventional theaters. The plot pits a human army against an alien army on a distant planet, bringing live actors and digital technology together to make a large cast of virtual creatures who convey emotion as authentically as humans."

Given Cameron's track record, I don't expect this flick to be much more than comic book level (not a good thing). The most worrisome thing is, as the rest of the article makes clear, it's the ability to play with the technology that drives the making of this picture not the need to tell a particular story. And that rarely makes for a decent film. And another huge amount of cash that could have been used to make half a dozen Children of Men will instead be sucked up to make yet another piece of schlock.