A Sony Xperia 1 III Pro, rather than an Xperia PRO II, is apparently being prepped for release according to a new rumor. The beefed-up variant of the Xperia 1 III will purportedly be powered by the Qualcomm Snapdragon 888 successor (model number SM8450) and bring a decent RAM amount bump with it.
https://www.notebookcheck.net/Xperia-1-III-Pro-Rumor-claims-Sony-is-prepping-a-new-smartphone-with-Snapdragon-888-successor-and-RAM-bump.545570.0.html