Quoted from AUKraut:

Nice!! At first glance things that differ from MMR:
- Coin mechs included
- New service buttons
- Backbox key location in a much more visible place than MMR
- White PCB for the playfield lights. I wonder if they help diffuse things better to help with visibility for the inserts
- Driver boards have moved to the backbox, meaning they won't swap between MMR and AFMR
- Video chip looks like it stayed under the playfield
- Speaker magnets look bigger, usually a sign of improved speakers
I'm sure others will find other items of note........

Quoted from huo:

Are LEs still available? The leds on the mini saucers are super cool.