I disagree with the OP's point about the Stamina and Health bars, I think these are the two parts of the HUD that really need to change, IMO. Especially the Stamina bar, it is too light and too small, it's very hard to tell when it decreases and when it fills up, and the health bar is just very "blah" IMO lol. I'm all for going in a new direction with the HUD, but I think the Health and Stamina Bars definitely need to be changed, too something more unique and easier to see. I absolutely agree about the announcer saying "FIGHT" after Round 2 and Final Round(which I love instead of Round 3 btw), that has been bothering me for a while, hopefully that's changed.
Also, the announcer does not announce "Character Wins" or "Flawless Victory" when you win a round, it would be cool if they changed that, the announcer has announced those in every MK game.