All signs suggests that yes, new model named Xperia XR will be officialy revealed on IFA next month.
On GFXBench we can see reasaults of model named Sony F8331 and XR is only phone from Sony we are expecting in near future. So what we will get in this not-so-interesting box?
System: Android 6.0.1.;
Screen: 5,1″ 1080;
SoC: Qualcomm Snapdragon 820;
RAM: 3GB;
Storage: 32(20)GB;
Cameras: 21/12MP.
Renders suggests two front speakers, duble LED under the rear camera and camera button on right side of phone.

Source: mGSM (polish)