Reply to Traktor S4, is it too late ?

I recently decided to upgrade my controller, since i have a really old one. After digging into every controller i found that the s4 fulfills all my requirements compared to the others. My main worry is that the s4 has been out for long now, is NI going to release a new controller ? Is it worth to buy the s4 now ? I don't want to risk the fiasco of buying an s4 just before something new is released.

Any suggestions ?