Some parts of the new One UI 5.1.1 and One UI 5 Watch, already available on the new Galaxy Z Fold 5, Flip 5, Tab 9, and Galaxy Watch 6 will start to become available soon on more Galaxy devices.
Galaxy zfold4 RSS
Samsung may not ship the Galaxy Z Fold5 with a built-in S Pen slot. According to a report, including a slot would require Samsung to increase the device's thickness and spend more on manufacturing.