...Hot Shot.

According to a new listing on BBTS, the unknown Rally Car from the Hasbro Database listing is Hot Shot, and will come out in August.
It doesn't mean that it is an Autobot either, as Movie toys aren't the best for guessing allegiances.

No images yet, but the Wave 3 has it with the 2014 Bumblebee, and Snarl... but no Stinger, which could be a "revision wave" like Lockdown.
(although, when the revision wave takes longer to come out than between "solid" waves, I don't see why it shouldn't be called its own wave)

BBTS have also listed up the Wave 3 Voyagers of Drift and Slog as well.