The team over at Dream Reactor have announced that every Tuesday from now until the new set’s release they’ll be adding 3 or more cards into the game in regular booster packs. They are not available for crafting, and are not valid for competitive play (ranked and tournaments) until next week’s update.
This week’s cards, which are already in play, are: Felix the Lightsworn, Baseborn Recruit, and Voidtouched Subordinate.
The next 3+1 secret cards – Thianor Wolftongue, Silver Fang, Eternal Servitude, and Slave Gladiator, should be in game soon. They introduce new keyword mechanic. Thianor Wolftongue, and Epic card, will take up a Rare slot in packs for a week, so try your hand at snagging him!