the official site has been updated with a power disc section with some new info.
Series 1:
consists of 20 discs (the toys r us ones aren't listed or included here)
4 'Ability' Discs
8 'Toy' Discs
8 'Customization discs
dumbo, elephant abu, and the buzz lightyear ride are the 3 rare discs of this series.
Series 2:
consists of 20 discs as well
5 'Ability' Discs
6 'Toy' Discs
6 'Customization' Discs
3 Unknown Rare presumably Toy discs
the nightmare before christmas customization discs are included
Series 3:
consists of 15 discs
4 'Ability' Discs
8 'Toy' Discs
2 'Customization' Discs
1 Unknown Rare presumably Toy disc
Flamingo from Alice in Wonderland Toy disc is included
page: https://infinity.disney.com/power-discs#set3
this is a grand total of 55 power discs, and the 10 toys r us/eb games exlusives bring it to 65.
for group totals of:
18 Ability Discs
22 Toy Discs
18 Customization Discs
4 Rare Unknown Discs
random conspiracy: on the site it specifically mentions that alice in wonderland skydome and texture are from the animated film.