some info and thoughts from pinsiders:
"Just played a few games on the Pro and the extra ball sure is nice. You can set it to whatever you want on the ramps (ie. just one hit if you want). I set it to 1 and sure enough I hit 1 ramp and extra ball was lit. In the options menu there is another choice for how much you want to increase the number of ramps hit for the 2nd extra ball collected, etc... (they are feature adjustments #11 and 12). Pretty cool."
"the update is good. like the new Flynn arcade awards and display. new combo sounds are neato. I actually added a ball in disc mb mode when I had only one left, pretty cool. only have 3 games on it, but I love what they've done so far! seems as if the light show is different as well, including flashers with modes."
"Just updated the code on my Pro on my lunch hour... It is awesome!!! My previous high score was 85mil. Just got 90mil on my first game. Got an extra ball, too!!!! Sweet Jesus that was nice!!! Can't wait to put her through her paces tonight!!!"
"tron is now a fun and manageable machine!
the extra ball (12 ramp shots) is easy enough, and honors your combos
disc mb is better, you can re start it on a timer with 1 ball left to close out super jackpot (easier)
in sea of sim you can change the rollover lanes for clue now
just these 3 differences make this so much fun now! don't know If I can sell my tron ever at this point. played 6 games, scores higher, plays better, awards combos"