It adds Luke Cage. Luke Cage!!!
The free to play massively online Marvel themed game, Marvel Heroes, got a massive, substantial update with Marvel Heroes 1.3. The update added a new hero, a Prestige Mode, a Hero Synergy System, Legendary Quests, and a hell of a lot of more stuff.
The new hero, of course, is Luke Cage, who’s even cooler now than ever before, if that’s even possible. Luke Cage is nearly invulnerable, and boasts the ability to summon Heroes for Hire, opening up an entirely new style of play.
Elsewhere, the Prestige System works as you would expect it to (once you max out a hero, you can restart at Prestige Level 1), the Hero Synergy System brings persistent skills across all your heroes (each hero now unlocks account-wide synergy bonuses at levels 25 and 50 that can be equipped on any hero. Since every hero can equip up to ten synergy bonuses, including Hulk’s health bonus and Spider-Man’s increased chance to dodge, players now have access to more hero customization), and Legendary Quests allows players to gain access to new combat and loot they wouldn’t be able to get otherwise.
Along with all of this, the costume, Lady Deadpool, may also now be bought in game.
It’s basically equivalent to at least a full fledged expansion pack.