In case you were wondering which characters Michael Bay is bringing back in Transformers: Age of Extinction and which new characters he is introducing, we have a toy list from Hasbro that tells us who we will see in the film. I've also included a video that features Grimlock's roar from the set of the film.

The list comes from Transformers Live, and apparently several of the names are code names borrowed from Rocky. Those are likely to be more spoilerish characters that are being kept hidden with the use of the code names.

The characters that are mentioned on the list include:

Bumblebee

Crosshairs

Drift

Galvatron

Grimlock (Dinobot name)

Hound

Lockdown

Optimus Prime

Scorn

Slag (Dinobot name)

Slash (Dinobot name)

Slingshot

Snarl (Dinobot name)

Southpaw

Stinger

Strafe

Then there are the codenames that are: Adrian, Bruce, Duke, Ivan, Max, Paulie, Rally Car, Rocky, and Thunderlips.

Here's the Grimlock roar video!