Among the new additions include two new Mega Pokemon (based on the similar concept that showed up in the videogames)- Mega Lucario EX and Mega Heracross EX; new Fossil cards for Kalos region fossils; and 18 new Trainer cards (which are one time status effect cards used during gameplay). Also introduced will be new booster packs, new themed decks, and new Holo cards (special edition rare shiny cards).
Pokemon XY: Furious Fists should be the last dedicated set on the Kalos region that we should see; presumably, with the launch of Pokemon OmegaRuby and AlphaSapphire later this year, we will see the TCG return to the Hoenn region as well.