Nowadays, Slackware-Current is quite active and it's taking most of the bleeding-edge applications such as XFCE 4.10.2 and KDE 4.10.2, GLIBC 2.17, GCC 4.8.0, and many others. This is a good sign that next Slackware release will be another great release as usual and it should support major components out there without any big issues.
Next release should also mark a new milestone where it should be a UEFI-compliant version of Slackware. Patrick is working hard on this issue with the help of others.
Meanwhile, Eric Hameleers is now working on an ARM port of Slackware on his new Google Chromebook. He is targeting the next Slackware release to bring a full ARM port of Slackware that can be used for modern CPUs