The official Pokemon site has revealed all 28 cards from Japan’s 25th Anniversary Collection! It will release on October 28th in Japan.
The gold Mew and full art Professor’s Research are presumably secret rares. The set includes Pikachu V-UNION and Pikachu V, which are promos in English.
The Japanese set also includes eight holo Energy cards that are not in our Celebrations set.
Update: Japan has now revealed the promo cards that will be released within the set’s promo booster pack. As posted before, the promo booster packs contains one of 25 cards. Fan receive a pack when purchasing four booster packs of 25th Anniversary Collection from Pokemon Center stores.
We don’t know how Japan will get most of the other promo cards released in English, like Light Toxtricity and Greninja Star.