To answer your questions:
1. No the game won't be as long as BG2. Do you seriously know any game that is as long as BG2? I can say that the game looks like a lot of fun.
2. I expect there to be around 130 spells in the game. I know that this might not seem like much, but it is still quite a bunch.
3. It will be non-linear game.
4. I would rate it different from BG2. You can't simply go around comparing games.
The areas that PoR is going to score in are:
- graphics
- combat system
- Character animation
These are of course a guess. For more info check the following site:
www.gamebanshee.com/poolofradiance/
Here you should find plenty of info. Let me know if you have any more questions
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