"distant past" could mean Beast Wars (it was set on prehistoric earth)

and if that's true then I cant wait to see what they make. possibly more pre earth bodies (Terroraur? Tarantulas? Depthcharge?)

but considering they already did dawn of futures past i doubt they're gonna do another beast wars set (that and dawn of futures past is from the future not the "distant past")

could be G1 Strika and other early transformers