Most packages have been rebuilt here or upstream. Since 18 years Zenwalk follow the same guideline : being the only true 100% Slackware compatible striped-down optimized system.
The main change in Zenwalk design lately, is the return of Mozilla Firefox as main browser. Due to the lack of improvements, especially performances issues and instability in Chromium. I also believe that privacy can be more easily achieved with Mozilla Firefox.
The Zenwalk "SlackBuild" packaging utility has also been updated so that it now allows to build Slackware packages from any source tarball without any configuration, as well as from any .DEB Debian binary as long as it's using the same toolchain and shared libs as Zenwalk, as well as from any Github URL.
You'll also notice some improvements in Netpkg : the multi-repository, dependency aware, package management system.