Bunch of Mozilla products were part of the latest security update happening on both -Current and -Stable. Seamonkey, Firefox, and Thunderbird are upgraded to the latest version (plus one Beta on testing/) along with a single package outside Mozilla's product, which is yasm.
So far, the only basic toolchain that has been updated recently was glibc. GCC and the Linux Kernel were upgraded, but it was in May, almost half a year ago, so i think Pat is still deciding which version of the GCC and Linux kernel should be used for the upcoming Slackware release. These two components are so vital because the Kernel controls everything within the system and GCC is the default compiler that will be used to compile many other applications residing on that system. Picking a wrong combination might hurt the performance or even stability of the system.