I guess we'll have to wait for next week's officially aired episode for a clearer pic, but you can guess from this as well: The whole block-shaped head suggests a (G1) combiner limb for me, and I can't shake it that I know who he is, even with the Wyatt-chin applied... Hmm, maybe Groove? The helmet's style and the detailed chin (even the G1 toy had a pronounced chin) do bear similarities. Personality wise, I can totally see him being a ninja, he's a born loner and a bit of a pacifist like Prowl. The other helmets we have seen (and I could make out) were from right to left: Jazz Dai Atlas Yoketron (everyone thinks it's Bludgeon, but simply, Yoketron's helmet looks like Bludgeon's. And it's logical that the head of the "dojo" gets the main place in the memorial) Devcon Ultra Magnus Springer (?) This guy on the right is also interesting - Almost reminds me of G1 Divebomb. At any rate, I bet his helmet/head is part of the vehicle's nose he transforms into. Well, again we'll have to wait for next week.