Source: shadowhunters.wikia.com

Here are teasers from Clockwork Princess, which will be released in late 2013, that Cassandra Clare has shared online:

Teaser #1 “Would you?” said Gabriel to Will, hotly. “If it was your family?” His lip curled. “Never mind. It’s not as if you know the meaning of loyalty —”

“Gabriel.” Gideon’s voice was a reprimand to his brother. “Do not speak to Will in that manner.”

Teaser #2 “He began it,” Cecily said, jerking her chin at Will, though she knew it was pointless. Jem, Will’s parabatai, treated her with the distant sweet kindness reserved for the little sisters of one’s friends, but he would always side with Will. Kindly, but firmly, he put Will above everything else in the world. Well, nearly everything.

Teaser #3 Jem knotted his fingers in the material of Will’s sleeve. “You are my parabatai,” he said. “You said once I could ask anything of you.”

Teaser #4 Jem drew the bow back and let the arrow fly; it struck the creature in the side. The massive demon worm writhed in agony, undulating as it swept its great, blind head from side to side, uprooting shrubbery with its thrashings. Leaves filled the air and the boys choked on dust, Gideon backing up with his seraph blade in his hand, trying to see by its light.

“It’s coming toward us,” he said in a low voice.

And indeed it was, the arrow still protruding from its wet, grayish skin, humping its body along with incredible speed. A flick of its tail caught the edge of a statue, sending it flying into the dry ornamental pool, where it shattered into dust.

“By the Angel, it just crushed Sophocles,” noted Will. “Has no one respect for the classics these days?”

Teaser #5 And the gold of her ruined wedding dress.

Teaser #6 "A very magnanimous statement, Gideon." said Magnus.

"I'm Gabriel."

Magnus waved a hand. "All Lightwoods look the same to me."