I would like to see more post-MK3 characters in this time. In MK9, all we had from that era were Quan Chi and Kenchi. There's a number of characters who I actually quite like from MK4 to Armageddon, and I hope to see at least a few of them here.
1. Reptile (Only one left that I will want from MK9 cast)
2. Projectile-trades like in Street Fighter. Both players spamming and hitting each other with projectiles in MK9 was dumb.
3. NRS leaving "let's give projectile for every character" times behind.
4. Better balance between characters.
5. Tweaks to meter building and management.
6. Smoother and more polished animations.