These are pictures of my attempt to improve set 42112 Cement Mixer Truck which is to be release later in 2020.
Features:
- drum rotating only one direction (mixing) when driving
  a) wormgear version: drum also rotating when driving backwards
     setup is inspired by https://rebrickable.com/mocs/MOC-44634/2in1/simplebutclever-2-only-one-direction 
  b) "Ratched" version: drum not rotating when driving backwards

- smaller turning cycle by improved steering angle
- cabin can be tilted forward
- funnel to fill the drum 

- axle width is smaller by (ca.) 2 studs, e.g. wheels are not protunding from chassis.

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