Below you can find the Invasion DLC details:
Pharaoh – An abandoned archeological site of an ancient Egyptian palace. Those most adventurous to explore this multi-level map will be handsomely rewarded with its deepest secrets.
Departed – A rural Mexican town amidst the Dia de los Muertos (the Day of the Dead) celebration. Complete a Field Order to unlock the Death Mariachi; armed with dual-wielding pistols that turn downed enemies into your own squadmates.
Mutiny – A pirate hideout in a secretive Caribbean cove. This eerie map includes an hauntingly unique killstreak: an escort of ghostly pirates to send your opponents to Davy Jones’ Locker.
Favela – A refreshed version of the fan-favorite Call of Duty®: Modern Warfare® 2 map. Return to Brazil to fight on the connected rooftops and narrow passageways.
Episode 3: Awakening – Descend into an alien underworld and strike at the mysterious puppet-masters behind the Cryptid invasion. Three new Cryptid species await players, along with some familiar enemies and allies.
Take a look at the official announcement tweet:
— Call of Duty (@CallofDuty) June 19, 2014
Source: Call of Duty Community