So the story goes with greenfield, that the patent/license on the design of the original fastcut only expired last year I think, which is why they had to change the design to the fastcut 2 while in production. Now though they have given those exact specs to the factory that is making all of the cox ride ons now, and are going to start selling them again, to my knowledge under the greenfield name.
In my opinion the success/failure of this will come down to the Quality of the build and the pricing, which is ultimately what ended greenfield, who wants an 8 or 9k 34" tractor mower when a 42" zero turn is under 5k.
Side note, Cox actually still have a large range of spare parts for all the late model mowers in the factory, you just have to contact them directly.