Killer Instinct gets infinite Survival Mode at launch, Arcade mode after Season 1 characters
"Our Arcade mode is going to come out when we've done the eight characters," Fornace said. "So it's not going to be at launch, at launch we're going to have six - Orchid's the last - and then we'll have two more following up post-launch."
"So once the last character comes out then we'll have Arcade," Fornace continued, "but in the meantime we have Survival. And Survival is like our endless mode.
Aside from standard local and online Versus modes, KI also offers an extensive Dojo mode, which Fornace says goes above and beyond your usual fighting game tutorial system.
http://www.oxm.co.uk/65649/killer-instinct-gets-infinite-survival-mode-at-launch-arcade-mode-after-season-1-characters/