Reply to Successor to S4?

Has anybody heard if anything is coming down the pipe in terms of a flagship controller from NI? Or is NI taking a more lateral approach, fleshing out a complete line of digital kit with the X1, F1, and Z2?

I ask, because the S4 has been out for a bit (yes, I know the S2 is still relatively new-er), and I'm not sure if investing in one is worth it at the moment. I'm looking to upgrade in the near future (read: months) from my Numark MixtrackPro (it does me just fine, but I'd like even tighter integration with Traktor and more fine grained control -less mouse use), but don't want to get the S4, only to have the newest thing from NI come out shortly after.

And yes, I know there are other fantastic options out there that are much fresher out of the design room (I'm looking at you, VCI-400SE), but I'm more concerned with the S4 right now, and NI hardware in general.

Also, I did try a google search and searching the community s, but I didn't find any semblance of an answer to this question. Sorry if this IS a repost.