As they are running out of moulds that have redeco potential (to make back their money faster)... it's not surprising that they would revisit this one.

I wouldn't really call it version 3 though, as the "version 2" mould only had some minor alterations, less than the amount of remoulding/re-engineering done to make the 3 coneheads.
The silhouette suggests that this is a completely new mould like Optimus, Megatron and Bumblebee, which if true, it would actually be version 2. (unless TakaraTomy officially list it as version 3 like they did with Optimus)