I was able to upgrade the Slackware setup on sombragris the trusty laptop, to Slackware 12.2 without any problem. I didn’t install KDE, though; rather, I plan to put the KDE 4.1 setup from Slackware current, /testing directory. I plan to get back with more news as they develop.
Meanwhile, Asunción is an unbearable mess. 38 C / 100 F with no wind is taking its toll on the city. This is going to be a very, very hot summer.