IK Multimedia have released DJ Rig for iPad, a separate app from the previous iPhone DJ Rig.
DJ Rig is a full-featured, double-deck DJ mixing app for iPad. It provides instant song-playing from the device’s music library, automatic tempo sync and beat match, sample-based pads, automatic mixing and performance recording plus an arsenal of high-quality DJ effects. When used with the new iRig MIX audio mixer for iOS devices, DJ Rig provides the most portable professional setup for mobile DJs and musicians.
DJ Rig has many advanced app features found only in professional mixing software and hardware combined with the magic of the iPad multi-touch surface to give DJs a whole new level of expression and creativity with the convenience of total mobility.
The full version is $20. There is also a free version, which lets you to buy features as In-App Purchases.
In both versions you need to buy samples via IAP to use the sampledeck, importing your own is not mentioned.