We are talking about the Galaxy M11 model. According to SamMobile, the firmware for the device came out with the build number M115FXXU2BUD8 and users in Vietnam have already started receiving it. In other countries, the system should appear a little later.
As for the changes, the device received the One UI 3.1 Core-shell (a simplified version of One UI 3.1 for budget devices) with a new interface, improved performance, camera and branded applications. Also, the developers added a security patch for April to the system.