Gandalf is held prisoner at the top of the tower of Isengard. He is visited by a friendly moth, who he whispers to.
Below, we see Saruman and his orcs preparing an army.
They're burning the wood of the trees and forging steel armor and weapons.
Saruman has also created a new breed of Orc by crossbreeding them with goblins (like a labradoodle but infinitely more terrifying). This new breed seems larger and stronger and will be later known as Uruk Hai.