I managed to get a 4 ball Weapon X going...somehow got an add-a-ball from gameplay, then another from the scoop. It's really easy to start; we're now going to see way more of that than Mags. Scores are going to change drastically, nailed 10mm on one WX multi alone.

Other nuggets:

Disc spins during Storm (don't think it did before).
Ramp moves during Mags.
NC during Rogue, as was mentioned above.
Ramp moves during Sabretooth.
Villain select menu no longer scrolls past Brotherhood or Hellfire if they aren't qualified -- they just don't show up as an option.

The game is much, much more strategic from the outset now ... you can make choices about whether to go for heroes or villains, and which you'd prefer to stack with your first Mag multi. You can get mags or weapon X loaded up so as to do one right after the other (don't think they are stackable...unconfirmed...). Early blackbirds might actually give you something worthwhile.

Blackbirds and villains light more frequently, I think. The mode start difficulty is set lower by default.

There's also a suggestive "reset wizard on new ball" feature adjustment.

The difference the code makes to the game is dramatic, immediately noticeable and, so far, 95% positive. (Not sure I like how much the ramp moves back and forth during modes.)

Looked the same to me. It lights a "shot" (quotes because individual standups and pops count as places the mutant can hide) and if you find it, you win. Although, now that I think about it, Xavier wasn't lit to actually reveal the needed shot, as was the case before. Maybe that's the difference?