As you've already known, the latest flagships of Sony Xperia are Xperia 1 and Xperia 5. Last month, there was a rumor related to its next four flagship lineups expected to be announced on IFA 2020.
Just recently, One of them was believed that might be called Sony Xperia 3 has been spotted at Geekbench with recently-announced Qualcomm Snapdragon 865 and 12GB of RAM, two-times bigger than Xperia 1 has. The code name shown in Geekbench is PM-1310 while Xperia 1 had its code name as PM-122X.
If the spec above is true, what we expect more is about its display that must be not FHD, but at least QHD for this upcoming flagship. Due to the new SD865, Sony Xperia 3 will certainly come with 5G connectivity along with the other three rumored flagships.
As you can see previously, the upcoming Sony Xperia flagships will probably be the Hexa-cameras devices according to the leaked render.