Starting on the 14th of this month, the Premium Edition offers early access to the entire game. At least, that's what I'm getting from what I've read. There's also the fact that, if you preordered the game, early access to MK11 included the entire game. I feel like it'd be more than a little fucked up to charge $120 for a preorder and early access only to allow access to part of the game.

EDIT: There's also this link: Mortal Kombat 1 Early Access

Sme people have the game and have beat storymode. So there's that. I'll get the game early on thursday so I'll see what's available.