I think your thread title should be: What do you think the mini game(s) in MK8 will be?
Personally I hope they don't add any mini games and just concentrate n the story and fighting engine. If they did, I'd like a game I've mentioned a few times before which would be a target test with various projectiles with the characters. Or they should just bring Test Your Might back as it's a classic.

A new Mini-game concept that I recently found in The Krypt section of MK:DA was a Test your might based theme in which upon succession of testing your strength the player you were attacking would be submitted to some kind of torture. e.g. Quan chi tests his might and pulls a crank. Kenshi is then lowered into a pool of lava etc,.

No, none. They need to just stick to a fighting game. No puzzle fighter, no stupid racing game, no break these bricks, or anything else lame. They need an all star cast, amazing arenas, and a better fighting system.

100% agree. Focus on the fighting, forget the rest.

they could add mk trilogy but if this spends much time to do it then don't add anything and just focus on the main game

Agreed

Skip the mini games, just make a great fighting game.