I'd try and watch as little footage of the movie as possible beforehand to be honest. I'm glad I didn't watch that first vid before watching the movie, it had too many spoilers (not necessarily story-wise, but great shots that I didn't expect that were stunning in the movie like waking up in zero-g). The motion capture vid isn't so bad; it really shows off the tech with only snippets of footage, and the Cameron interview is fine too.
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