Early 2011 Pioneer enters the Controllers market with two controllers, the Pioneer DDJ-S1 for Traktor is one of them (read this topic about the Pioneer DDJ-T1 controller for Native Instrument's Traktor). Both controllers are shipped including the software they are designed to intergrate.
What the T1 offers for the Traktor user is matched by what the DDJ S1 offers for users of Serato Itch. The DDJ-T1 intergrates lots of the features and controls in the same as Serato does. Supplied with the DDJ-S1 controller is Serato Itcha mixing software
The Pioneer DDJ-S1 is basically a controller for the software that send it's signals as MIDI to the computer by USB. The S1 has build in sound cards. There is a Master output on the back as balanced XLR and a Master out on RCA. The Line Input (Stereo RCA) has a trim control on the back and can be routed in Serato Itch to one of the channels. On the front side of the controller is a Headphone output for your headphones.
As there is a good chance that you will be operating Itch from a laptop the design of the housing encounts for that. As the main body is well below the surface you can easily slide your laptop underneath the DDJ-S1 to hide the keyboards. The screen is then located right above the mixer controls, or near one of the side, whatever there is space for.