A press release was sent out officially acknowledging the upcoming English expansion, Furious Fists. The expansion will contain 111 cards and Secret Rares, five Pokémon-EX, two Mega Pokémon-EX, and 18 Trainer cards, 3 of which are Full Art. The Theme Decks are now known to be named Enchanted Echo and Dark Hammer, and the expansion will be available August 13, 2014.
Key features mentioned in the press release for the expansion include:
The Japanese expansion, Rising Fist, only contains 105 cards, 103 of which will be within the set's 111 cards (the other two will be Secret cards). Thus, 8 Japanese XY-P Promotional cards will be pulled into the expansion. Rising Fist only includes 15 Trainer cards, so 3 of those 8 added promotional cards will be Trainer cards. New cards can be seen below.