They're Scramble City prototypes.

The reason they look 'newer' is that these prototypes would have been experimenting with what they could do at those price points.

Basically -- you'll notice no really new TECHNOLOGY in the prototypes, they're about as detailed and they TF similarly, as Gobots of a similar size. Clearly, as the process of development went on things got much simpler.

--Jhiaxus.
(Let's just get the idea that they're NEW toys thrown in the bin RIGHT NOW shall we?)

(Not sure exactly what the green construction vehicles are prototypes for, though.)