I don't mind the 12 rounds, but I think change the way the purse works so fighters get more for winning and less for losing.. Then i'd like to say say throw in a sliding scale so you get more for more rounds you win, but the judges already have to much power in a lot of cases and when their ridiculous scoring determins a couple of 100 thousand dollars, I wouldn't like to touch that one with a pole...
But a bonus for win by knockout would be good...

Just add some more haste and fireworks in the the 12 rounds we have and i'd be happy...

Plus thinking of some of the more boring fights of recent memory, they were already 9 rounds to long...