Still 11 months away from release, and yet to even finish filming, the Transformers 5 marketing has kicked up a gear with a building-sized billboard in New York city promoting the next movie.

It could be spoiler-ish, as it appears to show Optimus taking on some sort of dragon monster(s), who are standing with a flag of a modified Decepticon symbol.
I guess people will expect "dragons" in a movie about "knights".

Image is from BWTF.com.