Debian 12 is Set To Ship With KDE Plasma 5.27
In a break from tradition, Debian is opting to go with the newest version of the KDE Plasma desktop for the testing branch. This goes against their previous method of exhaustive testing before a piece of software is released with a distribution.
Debian is well known for shipping applications that seem to be out of date. The reason behind this is the focus of the "mother of all" distributions is primarily on stability. To that end, the developers have always ensured each release includes only software that can be trusted to run without problems.