So now that the Xperia 1 phone has started shipping to some parts of Asia and Oceania it is time to see what the initial slow motion 960fps samples look like. It seems that the length of the playback video is unchanged at 6.4 seconds for 720p and 3.2 seconds for 1080p. So 96frames are recorded at 1080p 960fps and 192frames at 720p. This is the same restrictive spec for three years in a row by Sony.
You would think by now the phone could have increased the slow motion buffer to something useful like at least half a second instead of 0.2sec for 720p and 0.1sec for 1080p. Think again, it seems we will not get anywhere near usable times in 2019 from the Xperia Line again. Your best bet for recording on Sony will be to get a camera like the excellent RX Series that allow much longer recording times and greater resolution.