If you do pay some attention to the trailer you get the hint that they definately want you to join them or DIE.
Well we'll see who will die after I get the game in my hands.
I'm not sayin' that DS is more powerful. BUT it is supposed to be the quick path. Being a Darksider means that you can use the Force for offence thus making the battles easier also you can "persuade" some people to help you. Whereas if you play the game as a Lightsider you need to put more effort to it.
I think that such thing did hold up to a certain extend in KOTOR.
Basically in the movies it was said that " I will not let this Republic to fall that had stood for thousands of years" and I think it is Palpatine who says so.
Usually the character you manage to redeem were usually Jedi.
I think the Sith rule of the two sucks.
Also I think that you have to have Sith trainning to be a Sith, otherwise you are Dark Force user (call Dark Jedi or however).
Lightsider are supposed to be weaker. Also if you play as LS you should expect the game to be more diffucult to beat, since Jedis don't use the Force for attacking.
Well with a game that will have 4 CD's or more I'm expecting an amazing ending, not one that lasts like 30 seconds. But somethings that shows that I have achieved something.
Being able to see your characters after the ending SHOULD be included.
What things would make you angry if you found they will be missing from KOTOR 2?
IMO if character development was as bad as in KOTOR that would be a major minus in the game.