As of writing, the brief voting period in the 2018 Transformers fan vote event is nearly over with. While we await the results of the choice of one of three Deluxe VS sets to be released next year (from which Impactor vs Mirage appeared to be taking a lead at one point), Hasbro has released via Facebook a post clearing up some small details, such as the incorrect identification of Impactor as a Decepticon in the sample art. For the most part it doesn't offer much, but one of the answers actually does give us something to work from. Keep reading to find out what!
"Yep! And, you'll get a glimpse into what drove them apart and led to them joining the Autobots and Decepticons in the War For Cybertron Trilogy. Get excited!"
"Much like the bounty hunter Doubledealer (who bears the Autobot Crest), Impactor wears faction logos which do not align with his true nature as a Transformer. You'll learn why and how he came to wear the Autobot crest, instead, in the untold stories of the War For Cybertron Trilogy."
"Wheeljack is one of the few Autobots whose Cybertronian vehicle alt-mode is seen in the original 1084 pilot episode of "The Transformers". This version has never before been created in toy."
Based on the third answer here, it seems like some of our supposition that Hasbro may try to adapt on-screen Cybertronian forms from the cartoon is bearing out. The clear desire to see that done is probably also a good sign that we'll probably see Wheeljack happen in some form regardless of the results of the voting. For reference, other characters seen in pre-Earth alternate forms include Soundwave, the seekers, Bumblebee, Jazz, and Wheeljack.