Update: Warner has officially announced the DLC, revealing the following about the add-on.
"Unfolding across iconic Gotham City locations, including Wayne Manor, Cold, Cold Heart equips players with the powerful Batman Extreme Environment (XE) suit and new gadgets including the Thermal Gloves and Thermocharged Batarangs.
"The game introduces several hours of all-new content in which players will battle through punishing, icy landscapes to witness Mr. Freeze's heart-pumping first encounter with the Dark Knight."
Original report: Story-based Batman: Arkham Origins DLC 'Cold, Cold Heart' will be released for Xbox 360, PS3 and PC on April 22, a leaked trailer has revealed.
The trailer also confirms the inclusion of classic Bats enemy Mr. Freeze, with the iconic villain seen making things go very cold at a Bruce Wayne awards ceremony.
Wii U won't be receiving the DLC because Warner has determined there isn't a strong enough demand for the content on the console.