i really would not take that as a huge thing or somthing massive is being made it would suck to get your hopes up that this will be a ground breaking update and it turn out to be a standard update i think its probably they just havent had time due to many different reasons or nothing is complete enough to show off or it could just be that this update is just uncooperative
My first guess was that's some large vehicle shaped with only specific jbeam sections visible, but looking closer, doesn't seem to be the case because some objects look perpendicular to each other.
It isnt an md/t series addon cause it would have the frame rails and slidenodes (they dont hide if you hide the parts), it isnt a trailer either for a similar reason (suspension parts) Its probably another part of the destruction update, it reminds me of that one machine in the next car game demo
Hmmm... Looks like a continuation of the building architect tool updating process. But man, the way the shapes are placed also makes me think about a double-decker car hauler trailer. Hope it's the latter, but I'm not all that optimistic...
I was thinking that it was a refresh for the Barstow, due to the sloping "roofline", but you're likely more correct on it being a prop. It might be a remaster for the large angle tester or large crusher, or perhaps a new prop entirely.