Sorry for such a late reply Dweeberkitty. I don't think this is based on the 13. But, it is nearly as up to date in many areas. We had to bring things "up" in order of KDE 4.
I can't give out the other differences off from the top of my head other than the Xorg. ALL I can say without those details is that the SOHO is pretty close. Far more up than the STD. Even the installer in this SOHO has been expanded with many extra features and more flexibility and so on.
We have also began the core of VL-7, which will not be based on SLackware either. The team has been working on developing it's own core, which is intended to be in VL-7. Still too early at this point to be certain, but that was the idea. Of course it will still be Slack compatible.
Hope this helps at least a little.