Last month, Samsung announced that it would commence One UI 4 public beta tests, starting with the Galaxy S21 series. Initially, the company pledged to open the beta program in September, which it subsequently narrowed to today.
Evidently, things have not gone to plan at Samsung's end. According to a post in the Samsung Members app, written in Korean, Samsung has been forced to delay the beta program because of unforeseen circumstances. It is unclear when the beta program has been delayed to, unfortunately.
Reputedly, Samsung still hopes to start distributing One UI 4 to the likes of the Galaxy S21 series in November. The delay has not coincided with any changes to which devices are eligible either, so the Galaxy S21, Galaxy S21 Plus and Galaxy S21 Ultra should still receive One UI 4 beta before other devices do.
Samsung has not announced which devices will be eligible for One UI 4 and Android 12. However, we have discussed which should receive another OS update in our corresponding article. Based on our calculations, Samsung will eventually update over 70 devices to One UI 4 and Android 12 across the Galaxy Tab, Galaxy XCover, Galaxy M, Galaxy F, Galaxy A, Galaxy Note, Galaxy Z and Galaxy S series.