The laundromat in the latest modular has a neon sign (printed). That would place the building around the 1950's, right? The clerk upstairs is using a typewriter too.
Again, there is no defined date for the modular line. Stop looking for one.
As for Belle's castle - yay, Belle! I'm 99% certain that Disney Princess will never give us a non-minidoll character, especially one as beastly as, well, Beast (my interest in the Frozen sled set tumbled after seeing Kristoff so neutered), but considering that there's a set of beast legs available, I'm also 99% certain that we'll see a Beast minifig in the CMF line. Lego is all about reusing stuff. You think it's a coincidence that City is getting a vulcano theme just when Nexo Knight turns up with a cast (and tons of new parts) made out of trans-orange lava stuff?
Speaking of which, that flame guy is awesome. Exactly what I need for my city to fight the TLM firetruck mech.
Edit: Also, a bunch of character starting having crossbows right when they were making a new Chewbacca...