It's been rumored that in TLK Stonehenge is the site of the Omega Lock, a device seen in TFP that can cyberform (Cybertronian terraforming) different worlds, or in this case Earth, making it into a new Cybertron and rejuvenating the Transformers race. There's no way to confirm its use, or how it can be operated. But I think it's fair to say that if Sentinel Prime or Cemetery Wind had found the Omega Lock their own plans would be rather unneccesary; Sentinel wouldn't need to waste time with enslaving Earth and shipping Cybertron, and Harold Attinger wouldn't deal with Lockdown for the Seed. (Sentinel Prime would have greater use of such a device rather than Attinger, who just wanted a robot army to improve his reputation) While each film has had a separate plan involving a separate MacGuffin, at least the first film and ROTF had a connection with the Allspark cube being destroyed and the solar harvester being used to refuel the cube. DOTM and AOE used a separate plan that involved humans gaining from siding with Decepticons and attacking Autobots, and not looking/caring beyond the short-term. (How is Sentinel supposed to rebuild his world? How is the Seed supposed to be used if only once?) I hope that this plot device can be put to use beyond its own film, for instance: - it's used to create new Transformers who can appear in future films - it turns part of the Earth 's territory into Cybertronian land, which makes it a separate domain and enables humans to have adventures on Cybertronian territory.
The concept was kinda neat imo, Primus' children are Transformers and Unicron's children are humans (kinda), which makes both races cousins, sort of. Though I don't think I would want to see this concept in the movie.
I think if they plan to have a real tcu they wouldn't just destroy a major device in the tf lore in the first movie it's introduced.
I liked it too and thought it was a great idea. Its only real shortcoming was that Unicron could obviously never really transform. Should've made him Earth's second moon or some shit. :-\