Gear Auction House
In Season 2, there is a new tab in the Auction House. This is where equipment is listed. Unbound gear comes from content higher than its tier. For example, in T3 contents, you can obtain T2 unbound equipment.
Cards are no longer used for a card mini-game in Season 2. Instead, they are collectible items that both provide small stat bonuses for collecting them, as well as equippable on a new equipment tab in your character info.