The Sony Xperia XA3 will go CinemaWide, just like the XZ4 flagship, but the renders so far havent made a clear distinction between the vanilla, Plus and/or Ultra models. Rumors have described two models so far one with a 5.9 screen (vanilla) and one with 6.5 (Ultra?).
Sony Xperia XA3 and XA3 Ultra side by side
These side-by-side 3D renders appear to show exactly those models, at least measuring the proportion of their screen diagonals matches the 5.9″/6.5″ rumor accurately. Both screens have 21:9 aspect ratio.
Size aside, the two models seem pretty much identical with side-mounted fingerprint readers and the same number of cameras front and back (the XA2 Ultra had a dual selfie camera, the XA2 had a single cam).
Sony Xperia XA3 color options
The good news is that theres a 3.5mm headphone jack on top of the Xperia XA3 Ultra. There are two grilles on the bottom, which may mean stereo speakers (but is not a guarantee by any means).
Sony Xperia XA3 Ultra side view top and bottom view
Of the internals, we know that the phones will use the Snapdragon 660 chipset and the dual camera on the rear should have 23+8MP sensors. The screen is expected to have 1080p+ resolution.
Source (in German)