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He seems set on just one more movie. There are talks to what it could be, three contenders so far:
Kill Bill 3
An R rated Star Trek film
A horror movie
Quentin Tarantino Says His Last Film Will Be Horror If He ‘Comes Up With Terrific Story’. So if there's a good enough story out there for him, a horror flick would a good choice for him to end things. He hasn't done one before, but it's certainly in his wheelhouse I would say. He certainly knows over the top violence and gore, so that would be worthwhile.
Kill Bill 3 would be fitting, but I would be less excited about it. Then the R rated Star Trek film, that would be something. Another genre new to him but at the same time not. Star Trek is certainly known for space action sequences but really its known as being very intelligently written, notably with lots of good dialogue. At least if you think back to the TV series.
That could be a really cool way to cap his directorial career, with a clever, dialogue-heavy space flick. Could be everything in one he is known for - dialogue, a memorable story probably told non-linear, distinct characters, good name actors reinventing themselves, over the top violence, epic cinematic style (plenty of backdrops with space and planets to make it his own), martial arts fighting even maybe, could even throw in some spaghetti western imagery and score. .. I'm talking myself into now, yeah, do that Tarantino.