Re: Metropolis
It's different from the London Trocadero in that it only holds a cinema, and a former arcade/Sega World that has now closed. It also used to have a bowling alley, I believe. There was a very small shopping component only on the main entrance, with about ten shops. It's now used a lot of its corridors as a sort of market, with independent stalls selling junk.
Montreal Forum is different in that it's basically a big box outlet, with AMC, Future Shop, and a few restaurants. I can't remember what else is there, but it's more big box to Metropolis' shopping centre.
There's going to be a food court in Metropolis, as well as small in-line retail in addition to the Future Shop and big restaurants. It'll be like an extension to Eaton Centre as well, I reckon. I'm not sure about the square footage comparison of the three either. It does remind me of Metreon in San Francisco too, which was a (then) Sony Theatres, and a few other shops.