Looks like Ant-Man and Marvel Studios have a decision on their hands. While the Marvel brand has become a juggernaught itself as far as most other studios scheduling films opposite they just got reminded they aren't THE Big Dog.
Sony just lined up James Bond 24 to open the same day, 11/6/15
Now that Mendes is locked in, the studio was also able to confirm a release date-- Bond 24, or whatever they wind up calling it, will be released in the UK on October 23, 2015, and in the United States on November 6 that year
The October schedule is still fluid and December could work, giving Bond enough breathing room for about 2 weekends.
I thought it bold when 50 Shades of Grey was scheduled as counter programming to GotG. Ant-Man would lose audience to Bond, too much crossover and Bond is one franchise with more clout and muscle than Marvel still. Star Wars being another.