James Cameron hosted an AMA on reddit earlier today. Some blessed soul had the good sense to ask him the only question that really matters.
"Mr. Cameron," queried redditor ContinuumGuy. "A Na'vi, the Alien Queen and the T-800 Terminator get in a fight. Who wins?" To which Cameron responded:
Is the T-800 armed or not armed?
An Armed T-800 with a plasma rifle will clean house, all it has to do is shoot the Alien Queen, and have it bleed on the Na'vi. I would think that all three of them unarmed. Queen beats Na'vi. Queen beats T-800, because the T-800 would tear the arm off a queen, which would dissolve the mantel and shut down the cyborg.
Now a Na'vi riding a leonopteryx, or a Na'vi riding a thanataur, that would be a different story.
Good on Cameron for fielding this question (even if we find his armed T-800 scenario a little too pat). Check out the rest of the AMA over on reddit. In all seriousness, it's one of the more interesting Q&A's they've hosted in recent memory.