There is now an image from Brickset of the LEGO Nexo Knights Royal Guard (5004390) promotional minifigure that will be given away from July to September. The only legit way to get it is with the last voucher from the 2016 LEGO Calendar which was given away last year with purchases.
The set comes in a box similar to the ones from the Target Minifigure Gift boxes but with full Nexo Knights deco. It’s kind of neat that it comes in a box instead of just a standard polybag. The Royal Guard itself seems to be an unique minifigure with updated torso and leg printing.