Sony’s most recent flagship phone was the Sony Xperia 1 II – that’s the Xperia 1 Mark 2, if you’re a little confused – and it looks as though work is well underway on what we’re presuming is going to be the Sony Xperia 1 III.

According to a reasonably reliable Japanese source (via GSMArena), one of the key upgrades with next year’s handset will involve the screen, which is set to be some 15% brighter than the one sported by its predecessor.
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https://www.techradar.com/news/sony-xperia-1-iii-is-rumored-to-get-an-upgraded-display-and-selfie-camera