Well, the rumour mill has been spinning for months and finally we have confirmation that the secret Marvel movie scheduled for 1st August 2014 will be GUARDIANS OF THE GALAXY. Marvel announced the news at Comic-Con, and also gave us full titles for the CAPTAIN AMERICA and THOR sequels. We will henceforth refer to those as CAPTAIN AMERICA: THE WINTER SOLDIER and THOR: THE DARK WORLD.
Some other bits of news from the Comic-Con panel included:
Marvel were also kind enough to reveal the official title cards for each film: