• Fully titled Gothic 4: Arcania (as opposed to the previous subtitle Genesis).
• Story set 10 years after the third title and located on various southern islands, each having different climate zones and its own flora & fauna.
• Same as in previous titles, there'll be a hidden place (temporarily blocked by a magical shield/barrier).
• Weather changes, full day and night cycle plus the ability to temporarily cast a spell and change the time of day (e.g. from day to night when you need to slip past guards unnoticed).
• Aside few NPCs from the previous title, some monsters will have a fresh look (however, trolls look the same as in Gothic III).
• With the ability to climb and ride on beasts.
•  Aiming for continuity, developers have gone through fan wishes on the forums and are planning on integrating some of them.
•  Fully DirectX 10 compatible with advanced shader technology: standing under a tree, not only light will be realistically dimmed, but looking up into the sky, you'll see the sun behind partially transparent leaves.

Via Tiscali games