There a recent preview (in French, unfortunately) here:
http://www.jeuxvideo.com/articles/0001/00010960-arcania-a-gothic-tale-e3-2009-preview.htm And there are some interesting points:
- There are some instant-travel monuments and a mini-map, but if you don't want to use them (and play like the old Gothic), they're optional and you can turn them off (something I'm sure some would've love to in games like Oblivion).
- The combat system has been revamped. There's not too much details about it, though. You can lock on your enemies, but you can also choose not to (and you get a damage bonus if you don't lock on).
- The combat seems similar to Revenant. You have an endurance bar and you have many different fighting moves that takes more or less endurance that you can chain in combos.You can also use side-moves (attacking on the sides) if you're against a group of enemies (the combat is said to be harder than Gothic 3).
- Spellbound seemed to have incorporated weather effects in the gameplay. It seems that in some way, you can control weather and NPCs will be affected (one of the examples given is that you can make a guard leave his post by starting a rainstorm.
That's all I could find in that preview in particular. It looks promising, but it's still a preview and a few things may change. It certainly looks like Spellbound is on the right track.
And if this one fails, there's still Risen.