Yes and no. Here's an example of how this works now...
Each character has two or three fatalities as well as a handful of brutalities (except you have to perform a certain requirement or series of requirements to perform). However, at the start, each character only has one fatality unlocked and one or two brutalities unlocked. This also applies to character costumes, accessories, entrances, exits, etc.
To unlock them- as well as costumes, accessories, character entrances, victory poses, konsumables (match buffs), and the like, you need to play the game. More towers you beat, more Koins and soul shards and hearts and time shards and green clovers and blue moons and... there's a lot of currencies. Anyway, you then go to the Krypt an unlock chests with your koins and shards and red balloons and the like. What's in the chest? No idea, some sperg might be mapping it out, but it is essentially hundreds of blind boxes.
So you might be playing as Kabal but you unlock skins for Kitana and Sonya instead. Tough luck- better luck next time!
It's basically a lot like Injustice 2's Mother Boxes, except even more bullshit.