Mark brought various prototype elements, including some which we couldn't photograph as they did not make it into production, and also brought several development prototypes of 70315 Clay's Rumble Blade. Elspeth DeMontes kindly took these pictures for New Elementary, which are pretty self-explanatory thanks to Mark's fine labelling skills. You'll see many interesting new parts below which we will return to here at a later date, and Mark also described some other fascinating ones from the other sets, such as the new shooter part which consists of just the 'Mixel' ball joint with a short 3.18 bar projecting out... very exciting.
Its back is an antistud. So that central section is like a brick with the 'chest' stud on top and the 'back' antistud on the bottom. I say 'like a brick' because that is no ordinary 1x1 LEGO brick! It is a perfect cube; not the 5:6 ratio all LEGO bricks are based on. How fascinating... and how irritating that it has all those guffins poking out of it, but then, really quirky LEGO pieces like this can inspire all sorts of creativity.
This torso is the same across all of the 'bots' in the Nexo Knights sets - they also come in 70312 (knight) and 70317 (chef!). You can read more and see more pictures in Huw's review of Mark's talk, over at Brickset.
Nexo Knights are released on January 1 2016.
Our thanks to Mark Stafford for bringing this awesome display to Brick 2015 and to Elspeth for the photos.