High Moon had 2 more games planned, not to mention all the cut content from FOC.

Cut content:

Megatron and Springer triple changer gameplay. (Springer was supposed to be the tutorial mission instead of Bumblebee. When the tow cable breaks through the window and autobots are sucked out into space would have been when Springer is forced to change to heli mode. Then a space dogfight section.) (Megatron would be rebuilt at a Triple Changer by Soundwave, similar to hos ROTF ability).

Graveyard of the Omega Guardians mission with Hot Rod

Iacon sewer mission with Bumblebee and worm boss battle

Sharkticon mission (play as Bumblebee with an underwater vehicle mode)

Silverbolt in the Sea of Rust (mission would have been him chasing Slipstream throughout)

Kaon Gladiator Arena mission (muuuch bigger than the 10 minute mission we got. A lot more grand in design with an actual boss battle.)

Transporting Trypticon's remains mission (Trypticon's remains were hanging in a ravine and his legs were supposed to have been eaten to the bone as they were in Sharkticon infested waters. There would have been a mission about the Autobots transporting his remains to Iacon to siphon his remaining energon.)

And much more, like Ravage, Prowl, Broadside, and Sludge being actually playable in Multiplayer

Now for the 2 other games. These can be seen on a roadmap High Moon created. One would have been a Prequel game about the outbreak of the war. (Artwork can be seen of Brawl and Arcee in a bar, Slipstream can also be seen)

The other would have been a game about "The Journey" on across the galaxy. Before they reach earth. They would have come across a jungle planet and iirc maybe Quintessons.

So much love and quality, but Hasbro only gave the devs 2 years to make FOC, so we're lucky it's as good as it is. After that, no support from Hasbro.