The new system is pretty sweet sounding... constellations for skills / magic, look at the ground and it zooms out into your map...
also; Perks. yes. Levels up to 50 at least, if you have a few "main" skills (ie high ranks / concentration in that area) you will level faster. New AI for monsters / creatures you find out and about, they just don't run up and attack you immediately now.
Neat little thing about AI in towns too; they discussed like dropping an item in town,and three scenarios with it-- it can lie there forgotten, a small child will bring it to you asking if you dropped it, two individuals end up fighting over it.
Discussions with NPCs won't result in a zoomed up dialogue with them, camera will be panned back; they will continue doing what they are doing while talking to you, or at least act naturally.
info on sidequests / developments / etc can be heard in the ambient conversations, and automatically logged into your journal