The KDE Plasma 6.6 desktop packages have been merged for Slackware. Yes, Plasma 6.7 released today as the next upgrade to pursue for Slackware.
The Slackware change-log noted of the long-awaited upgrade of Plasma 6 in Slackware:
"Well folks, it seems that the stars have aligned to bring us a bunch of long-awaited updates, including ffmpeg8 and Plasma 6! This has been developed in a side tree for several weeks, and I'll be happy to get that off my plate and have a greatly reduced todo list. Many thanks to alienBOB for getting the tree in good shape, helping when I got stuck, and for being a good manager who inspires me to do my best work. :-) And we both extend our thanks to the illustrious LuckyCyborg who ported the build scripts to Plasma 6 in the first place and then maintained Plasma 6 for Slackware users to test for a couple of years. And thanks to everyone else who helped out with either of the Slackware Plasma 6 projects that these updates grew out of. Have fun!"
In addition to KDE Plasma 6 and FFmpeg 8, Slackware also landed the GCC 15.3 compiler, GStreamer 1.28.4, the Linux 7.1 kernel is in testing, and also an updated XLibre X Server in testing.