The set will release in Japan on November 2nd. Each 10 card booster pack will come with four holos, including one Pokemon-GX. We don’t know the full breakdown of the booster packs yet, though they will probably contain at least one reverse holo.
All of the set’s normal cards were revealed yesterday. The set will have at least 90 secret rares, which is the largest for any English or Japanese set in the game’s history. Only 14 of them have been revealed so far.
It is currently unknown how we’ll get the set’s shiny cards outside of Japan.