As you will no doubt have read CapnRex101 and I have been at BRICK 2015 at ExCeL. It was an excellent, but exhausting, weekend. I hope to write a full show report either today or tomorrow but in the meantime you might find these images of 70315 Clay's Rumble Blade of interest.
Mark Stafford gave a presentation about its development at AFOLCON and he was also in attendance at the BRICK show talking to visitors about the model, being a LEGO designer, Nexo Knights and so on. Several prototypes showing the development of the the model were on display and photos were allowed, so after the break you'll see how the final set took shape and also the page in the instructions showing the Nexo Knights minifigs.
Incidentally, the theme was apparently nearly called Nexonites...
First version, using silver space wheels:
Third and second version. The detaching bikes can be seen in the third iteration.
Fifth and fourth versions:
How it all comes [email protected]
Development of the shield piece:
Minifigure guide from the instructions:
The bots, bottom left, are interesting. They use a new body piece, basically a 1x1 brick with the usual skeleton leg attachment joint at the bottom and a long neck stud on the top. The 'shoulder pad' pieces are a soft plastic: I'm not sure if they have a hole in them to affix to a post on the 1x1 brick body or vice-versa. I guess we'll find out soon enough.