Since this is a translation of an overseas article, there may be some mistranslations.
https://www.sammobile.com/news/one-ui-9-reveals-galaxy-fold-wides-wider-screen/
One UI 9 Reveals Galaxy Z Wide Fold's Actual Aspect Ratio
The next generation of foldable devices is expected to launch with One UI 9 pre-installed.

Samsung is preparing three new foldable phones for release this year: the Galaxy Z Flip 8, the Galaxy Z Fold 8, and a new model tentatively called the Galaxy Z Wide Fold.
The Galaxy Z Wide Fold is expected to feature a significantly wider foldable display, which will be a major departure from previous Galaxy Z Fold devices. More details about this have now been revealed through One UI 9.
We accessed the firmware files for the SM-F971B, which is expected to be the Galaxy Z Wide Fold. Inside the firmware, we found images that suggest the device's display aspect ratio. Based on these visuals, the foldable screen appears to have a 4:3 aspect ratio. You can check out the images below.

In comparison, the Galaxy Z Fold 7 has a foldable display with an aspect ratio of approximately 1.11:1 (or roughly 3.33:3), which is close to a square. This suggests that the Galaxy Z Wide Fold will offer a noticeably wider viewing area than previous Galaxy Z Fold devices.
Furthermore, this aspect ratio is closer to that of the Galaxy Z Trifold. The wider screen could improve the experience of watching photos and videos, making it more practical than previous Galaxy Z Fold models. This could put it on par with Apple's rumored foldable iPhone, which is expected to launch later this year.

The Galaxy Z Flip 8, Galaxy Z Fold 8, and Galaxy Z Wide Fold are expected to debut in July 2026 with Android 17 and One UI 9.0. There are rumors that the Galaxy Z Fold 8 and Galaxy Z Wide Fold will feature a foldable display with almost no crease for an improved user experience.
▶ Source: https://www.sammobile.com/news/one-ui-9-reveals-galaxy-fold-wides-wider-screen/