Similar to the RPMs tracksets from TF2 & TF3, there are two for TF4... but both are licensed merchandise "games" by a company called HTI, so not a Hasbro toy/product.

The first one is a nice looking carry case in the shape of Optimus with Trailer, that opens up to form a loop track.... while the second one is a standard loop track that ends up with a launch ramp made by Grimlock's tail.

No idea if either will show up here.