Actually last year we heard loads of rumours and this year is very silent.
Now I do not expect much new from NI, they already came out with the S8 and from Pioneer, since the DDJ line is really new and the DDJ-SX2 is their latest thing.
Vestax did bite the dust, so nothing there. Which is sad, I had high expectations as I heard rumours of their pipeline being really strong.
Numark has the NV and the NS7 II relatively new and also just released the Akai (same company) controllers, so I do not expect much.
Reloop has strong sellers with the TM8 and the Beatmix series, but then they did surprise us often with controllers we never heard about, so they are always good for a surprise.
So my expectations are not huge for NAMM and I guess if any it will be evolutionary steps if any. But then we have been caught by surprise many times.