The marketing campaign for the new burger centers around whether it still counts as a Big Mac if it includes bacon. So far, according to the poll on the McDonald's Canada website, 60% of votes indicate that it still indeed a Big Mac while 40% says it's not.
Interestingly, the Big Mac in Canada includes processed cheddar cheese rather than American cheese but is otherwise the same with two beef patties, special sauce, lettuce, pickles, and onions on a toasted sesame seed bun.
Here's a TV spot to illustrate the marketing angle they're going with:
Photo via McDonald's Canada.