But he DID change the starfield in the scene with Rose at the end; we can thank Neil deGrasse Tyson for that, LOLOL.

I read about Cameron's trip to the Mariana Trench, and apparently, he's going back again - that man's not going to be happy unless he can die in a hull breach somewhere five miles below the surface! But it's neat he's using his money for research along with his own hobby and is willing to share the results with actual scientists to learn more about the ocean on these things.