What Quests Change the World?

No i'm not talking about the Academy, I am just curious as to what missions change the world physically, are they mainly bonus quests?

i.e. Player A completes a quest but Player B skips it, Player A now has different options in his world. Arena-net has said that this is in the game everywhere and i was just wondering if anybody knows what quests do what.

The searing is the only change, unfortunately.

I have read reviews in beta where players could change the world by saving the prince. Surely they didnt take this out did they? And surely there are more quests that change the world as this was one of the main 'selling points' of this game.

In theory they never lied, you complete a quest and it opens new paths for you or allows you to do more quests which changes your characters choices/perceptions in the world, not yours but your characters

Yes this is exactly what i am asking, what other things change the world for you and how do they change it. Im talking about unique things not like complete a quest that everybody does and a new path opens up. For example i never saved the prince in the mission (because you dont have to) and so in my world the prince is forever dead. Somebody else may have saved the Prince so they have a different perception in their world.

Another example given by Arena.net was that one character could do something like eliminate a race (for example the Char), now when somebody who had done that is in your party that race or mob does not exist in your mission. So im wondering where are these type of quests that Physically change the game for your character depending on a chioce you made when completing it? Where they just hype or do more exist? Is my game play experience the same as yours?

Eliminate a race? Thats pretty crazy.. must happen much later in game... I am still in southern shiverpeaks (as in after ascension)