Marvel is locking in their upcoming movie dates even before announcing what the movies will be. The studios has announced that there will be new movies from them on July 28th and November 3rd, 2017, July 6th and November 2nd, 2018 and May 3rd, 2019.
These five join two other untitled movies scheduled for July 8th, 2016 and May 5, 2017. Plus there is Captain America 3 set for May 6th, 2016. Looks like 2017 is going to be a 3 Marvel movie year.
Just speculating here, but the company may have announced the dates now and are saving the movie titles for next week. This is basically calling dibs before DC can announce any potential film dates/titles at Comic-Con.