It has been rumoured and now we have a picture of the Ork Flakk Wagon or Flakwagon from Forge World.
It is based on the plastic Trukk model, I did think it may be based on the (now rather old) Forge World Gunwagon as the Forge World Epic Flakwagons are.
Looks very Orky. Looks like the back and the guns are resin, whilst the front is still plastic.