The Sony Xperia XZ Premium and XZs have been exploding in popularity since the announcement was made at MWC 2017. The capability of the stacked sensor to record slow motion video at 960fps in HD 720p has opened possibilities only dreamed of a short year a go in the phone video space. Even the Galaxy S8 seems to be in the running with 1000fps video touted as a spec in the rumors.
The stacked sensor technology is the same one used in the Sony RX series cameras but this time attached to a smaller cellphone oriented sensor block which makes it possible to be combined with a powerful SoC solution to offer these high frame rates. It is of note that the recording limit on these devices is 1 second at 960fps.