KDE 4.6.2 has been released few days ago and packages for Slackware-Current are now ready on AlienBOB's KTown and also in several mirrors (taper and UKDW).
Please note that this is a maintenance update, so no new features included on this release, just bug fixes and translations updates.
Here are the repository information for UKDW mirror:
Update (11:37 PM): kdebase-workspace has been rebuilt to patch the shutdown Eric mentioned on his blog. Now it's back to sane condition and you can shutdown properly