Reply to DDJ SX as a DVS Mixer = No Rane Hardware?

A bit confused about the soundcard options within the upcoming DDJ SX ...

As I understand, one could use an S4 and Traktor Scratch Pro with a pair of TTs to essentially re-map the S4 as a mixer.

DJ Dummy does it in this sick as F video:

Can I do the same thing with this sparkly new DDJ SX and use it as a DVS Mixer with Serato DJ (SSL)? I would LOVE to bypass getting some SL1/2/3 from Rane. I've been looking at specs, but am not the most educated when it comes to DVS, soundcard requirements, and the interworkings of the whole Serato + Rane relationship.