I find the current trend of Lego sets based upon movie franchises interesting. CUUSOO is kind of reversing the theme development that Lego has used recently with a number of their current themes. Instead of representing soon-to-be-released movies sets, CUUSOO is becoming a means of getting old, popular movies retroactively released in Lego form. These, coupled with the current movie-related themes, are really beginning to tilt the Lego product line heavily toward movie themes.
Ten years ago, the only movie ever represented in Lego form on a broad scale was Star Wars, yet now we're looking at Indiana Jones, Harry Potter, Prince of Persia, Pirates of the Caribbean, Lone Ranger, Lord of the Rings, Hobbit, a number of DC and Marvel Super Heroes (Iron Man, Superman MoS, Spiderman, Avengers, etc.) and the aforementioned Star Wars, along with the new Lego Movie and Ninjago movie in development, and these upcoming CUUSOO entries for BTTF, Ghostbusters (unapproved) and possibly Wizard of Oz. That's quite a product line shift in a relatively short amount of time. I expect this trend continues as Lego uses these blockbusters as free advertising to sell their toys and to convert non-traditional markets to buyers of their other themes.