We found out just recently that Walmart would be featuring its own exclusive subline of The Last Knight merchandise under the branding "Autobots Unite". Apparently that's going to be part of a larger marketing event involving the movie, as documents uploaded by imgur user "FunkDrunkula" show a plan of action that will include store appearances by character costumes, an online campaign to track the Autobots on the tour, and of course the merchandising in store. The tour is marked as running from June 12, to November 3. Keep reading to see the scans with full details!
Hot Rod, Bumblebee, and Optimus will be the featured characters, and will be making appearances based on region. The markers are color coded, so you can get a sense of the distribution versus the slightly vague wording in print. Hot Rod will be visiting the largest range of locations, while Optimus and Bumblebee will be far more concentrated in their coverage areas thanks to denser population in the eastern half of the US.