Ambidextrous reduces the cost of using Grenades and Scrolls by 1 Ap when you have an empty Offhand.
(To be honest I would rather it was the removal of the DW penalty but the actual effect is still interesting)
There is also another new talent called Unstable which causes you to "explode into a bloody cloud upon death dealing 100% of your vitality as Physical damage in a 3 metre radius"
There is a gameplay video on Youtube where if you pause at lightning speed (as the narrator does scroll over some of the talents to show Ifan's Pet Pal as he is about to converse with an animal spirit)
I don't know if I can actually link the video because of my post count but the video is "Divinity Original Sin II Undead Gameplay Video #2" uploader is GameBanshee and roughly 10 mins in is where he hovers over the talents.
September 14th can't come soon enough so I am just scouring the internet for everything about the game
Honestly, Im glad its not considering how much damage rogue and dual weild warrior do. This is also considering the removal of backstabber as a talent since now knives by default give backstab.
also, Unstable seems like a potentially awesome talent on someone with Comeback Kid