Serato just released a beta version of their 1.9.5 update for their Serato DJ software. In addition to bug fixes and stability strengthening, this update now adds compatibility with Pioneer DJ’s Nexus 2 hardware – which includes their  Pioneer DJ DJM-900NXS2 and Pioneer DJ CDJ-2000NXS2 models. Serato DJ 1.9.5 public beta is available here.