Quite frankly, the whole idea of manufacturers is to convince you that whatever state of the art controller you bought two years ago is now totally obsolete and really harms you more than it benefits you. And that you really REALLY REAALLLLYYYY need to buy that new controller they just came out with.
Logical conclusion: manufacturers have to come out with new gear every two year or so.
It stands to reason that NI will come out with something new. What exactly nobody knows. Might be a high-end iDJ Pro like machine with full iPad Traktor DJ integration. Who knows.
Greetinx,
C.