Yup, they discontinued the large size. When asked they said it was due to government regulation. ie. the government had banned large drinks. However, that was not true. It was because some provincial government was bringing in a law requiring nutritional information to be displayed. Cineplex assumed people would see the large drink calorie count and opt for the "regular" so they preemptively discontinued the large size and made "regular" the new large, charging the old price for a real large. Cash grab.
The concern for my health is disingenuous because while she was telling me large was discontinued for government health regulation reasons she then offered me a gigantic tub of popcorn with extra topping. Plus, when they have special promotional tie-ins that include special drinks, those are the old "large" size (for an even larger price).
Long story short, I find the regular drink sizes too small when you're munching on salty popcorn.