Warner Bros Interactive has confirmed that Injustice 2 Legendary Edition will be available to purchase from March 30th. As you would expect from such an edition this package will contain all of the downloadable content released so far such as fighters like Darkseid, Red Hoods, Hellboy, and The Teenage Mutant Ninja Turtles. The Premiere skins from the Ultimate edition of the game will also be bundled in.
Along with the Injustice 2 Legendary release a new update will be rolled out that adds the Learn Hub, which is an expanded tutorial, new Gear items for all characters, level cap increase to 30, and a new augment slot unlocking at level 30. For collectable fans there will be a day one edition of this version of Injustice 2 which includes 11000 source crystals, an Injustice 2 coin, steelcase, and comic exclusive download steel card.
Source: Press Release