Con Artist [5/lvl]
This new talent gives +1/level (max 4 levels) to Acting, Disguise, Fast-Talk, Gambling, and Merchant. Con Artist is meant to emphasise the "social" aspect of Thieves, and to replace Craftiness/Street-Smart, both of which already have skill overlap with Skulker.
Reaction Bonus: Street urchins, scammers, forgers, and the like.
Alternate Benefit: +1/level in Contests against somebody trying to fool you.
This talent gives +1/level (max 4 levels) to Garrote, Knife, Poisons, Fast-Draw (Potion), and Fast-Draw (Knife). Assassin is meant to replace the Assassin template from DF12: Ninja, which makes the same mistakes the Thief did (that is, inefficiently spending points on skills).
Reaction Bonus: Other assassins.
Alternative Benefit: +1/level to avoid self-inflicted poisons.
In Plain Sight 
In Plain Sight is a perk that allows a Thief to try to sneak in areas where this would normally be impossible: guarded well-lit hallways, open fields, and the like. They suffer a base -10 to Stealth to do so.