Plasma 5 comes from Factory, so Leap 42.2 will get the latest Plasma 5 that’s available in Factory at release time (in about a year).
For 42.1 I am not sure.
Like with every other release before, you normally only get security and bugfix updates (although exceptions are possible).
Plasma 5.4.3 has been submitted and will be released as update soon.
But I don’t know if the upcoming 5.5.0 (and further releases) will be released as update too
In SLES 11 used the same major version of KDE 4.5x and I will afraid to do the same with SLED 12.
AFAIK SLES 11 and SLED 12 did/do not contain KDE at all.
As Leap 42.x is a clone of SLED 12.x, I will fear that the same thing happens in Leap 42.x.
Leap 42.1 is not a “clone” of SLED 12.x.
Some base packages come from SLE 12, and are maintained by SUSE.
Now Plasma 5 uses version 5.1x, this version will be used throughout the development of Leap 42.x
Leap 42.1 comes with Plasma 5.4.2, this will be updated to 5.4.3 soon.
You probably mixed that up with the Frameworks (the libraries), which are at version 5.15.0 in Leap 42.1. Here an update to 5.16.0 has been submitted too, again I cannot tell you if/how many future updates will be officially released for Leap 42.1.
I don’t want to use the repository KDE Frameworks 5.
If you always want to have the latest version, you’ll probably have to.
Just like it was with every openSUSE release before.
Or use Tumbleweed.
Here it says:
**That’s true?. **
Why should that not be true?
It has been true for every openSUSE release before.
Also GNOME has been taken from Factory (because the version in SLE is rather old) so is/was also the latest version (ok, 3.18 has been released since), and this will be the same for 42.2.
Actually, the corresponding maintainers have to decide whether a package is taken from SLE or Factory, or even is developed in a dedicated branch for Leap (like the kernel and Xorg, e.g.).
But yes, the desktops (KDE and GNOME at least) are taken from Factory as mentioned.