Two new features are shown off in the developer video diary below. First, the Minion Bar has received some love. It been updated to show you enemies as well as allies when choosing which Minions to play cards on.
Second is the 'Attack Player' card. This micro-management tools allows you to designate another player and all your Minions will default to attacking him/her. This card gives you a level of control not previously available (but often asked for) in the game.