It’s common for a major movie to operate under a ruse title to throw people off while they’re filming in a public location. Return of the Jedi famously was Blue Harvest, but that tradition continued to more modern movies; including comic book movies. Captain America: The Winter Soldier has just cast its big villain in the form of Crossbones, and now the fake title has been revealed.
If you see a movie being filmed called “Freezerburn”, you’ve just found the Captain America sequel. That’s the title they’ll be using to throw people off the scent of set photos, and it follows the first Captain America’s title of “Frostbite”.