Promobricks.de posted the Lego Store Calendar for January 2017 and there's going to be a Nexo Knights freebie.
The image resolution isn't very good, but it looks like the giveaway is from January 16-31, 2017.
Get a FREE Knighton Rider (minifig and motorcycle) with a Nexo Knights purchase. It looks like there is no minimum purchase required, just buy any Nexo Knights set.
I'm going to go out on a limb and say that this may mean the new Nexo Knights sets will be out in time for this promo. There is some speculation that January will be reserved for promoting the Lego Batman Movie and we may not see new Nexo Knights sets until March, after the Lego Batman Movie is released.
Wave 1 came out in January 2016 and with Lego putting on a freebie in January 2017, I think that we'll see the 2017 Nexo Knights sets in mid-January.
P.S. Is it my imagination or is that a black Nexo Knight shield on the wing of the Mini Batwing?