An upgrade to -current is rather simple, but keep in mind that -current is a development branch, so thinks may break from time to time (though -current is pretty stable).
To upgrade to current follow these instructions:
1. Uncomment a mirror for Slackware -current in /etc/slackpkg/mirrors, if you have previously uncommented a 14.1 mirror comment it out again
2. Run these commands
Code:
slackpkg update
slackpkg install-new
slackpkg upgrade-all
slackpkg clean-system
lilo
After a reboot you should have a clean -current system.