https://www.cnet.com/news/watch-stanley-kubrick-explain-the-ending-of-2001-a-space-odyssey/

The final scenes of Stanley Kubrick's 2001: A Space Odyssey may finally have an explanation, with a video surfacing on YouTube that purportedly shows Kubrick detailing the meaning behind the film's ambiguous ending, io9 reports. 

As io9 explains, Kubrick doesn't actually appear on screen. Instead, it shows Japanese film maker Jun'ichi Yaoi on the phone with the renowned filmmaker, asking him "what is the meaning of [the] last scene?"