Blizzard has announced a trio of changes to Hearthstone card packs. The team's philosophy is that getting card packs should be fun, exciting and should give players cards they need most.
First, every time players open a Legendary card pack, there will be a Legendary in it that is not already owned. This allows players to craft without penalty.
Secondly, players will never open more copies of any card than can be used in a deck. That means no more getting 4 or more of any single card.
Lastly, every player is guaranteed to receive a Legendary card within the first ten packs of a new set.
You can check out all of the details in the video below or on the Hearthstone site.