Yeah good luck winning critics over when you have the explain both Unicron and Beast Wars in the same movie.
Unless they somehow make Unicron the same Unicron from TLK, who has travelled back in time to attack earth prior to the events of the 2007 film, and somehow the Maximals saw this happen and travelled back in time as well to warn Prime, stop it happening, it's gonna be a headache for anyone who hasn't been following any of the other films.
Visuals aside, I will be impressed if this actually turns out to be a fully fledged plot, and not just an excuse to make TF fans run to the cinema to see their iconic favs wasted on screen like so many of the other films kinda did...