The first series of Rescue Bots had Electronic Chase and Heatwave.
The second series that is now being released, under the sub-title of "Energize", has Optimus and Bumblebee.

Both have now been released, for US$27 each.

Since neither transform, we still haven't seen any convertible Rescue Bots for Series 2 yet.

It also shows how little Hasbro learns with their focus on Optimus and Bumblebee... as these two characters spent less than 5% of time on the entire first season of the Rescue Bots Cartoon. And yet, the second series of toys has 4 of the 8 toys so far being Optimus or Bumblebee. If there are kids or fans of the cartoon, they are going to want the cast characters... not the characters that only show up in 2 out of 26 episodes.