I don't really have complaints, just more a few things I'm worried about.
I had preferred Cassie to be on the main roster without Sonya or Johnny, who could become DLC at a later point. However now that Sonya is in, I just hope Cassie is a skin for Sonya, especially since signs are pointing to Johnny also being on the roster. Having all three of them seems a bit too much, imo. One of the main issues people had with MKX was the roster being kinda dull, a lot of legacy characters on it who were just there to be there while a lot of fan favourites were no where to be seen, and I just don't want a repeat of that in MK11.
Of course it depends on how the rest of the roster will be outside of those three, but with the info we have now, it doesn't look as good as I had hoped it would.
Another thing is the movement in the game. I wasn't a fan of the Run feature, so I don't mind it being gone, however, I wish the walk speed and dashing would be just a tad faster, maybe have the dashes go a bit further, and the jumps less floaty. I'm aware the devs wants the game to be a bit slower and more strategic, and I'm completely alright with that, but as it is now it looks a bit too slow when it comes to movement.
The speed of the battle, as soon the characters attack and do combos, looks good though!
That's about it though. Other than these few things, I'm loving what we've seen so far!