GW2 is completely different from GW1. It really is dynamic content open to everyone at anytime at any level
You know this because you've played it?

You dont talk to quest holders, you enter an area and an NPC is shouting that such in such needs to be done.
This doesn't sound any different from a typical quest system except you don't need to talk to the NPC. I don't see what's so revolutionary about that.

You dont have to activate it, it just happens with or without you. So you can choose to participate or not.
We already have this in those garlean invasions. That happens whether you choose to participate or not. They jiust need more stuff like this.

I'm personally really going to enjoy watching the backlash when GW2 releases. People are setting their hopes way too high.
I honestly don't predict it will take very long before stuff gets nerfed/changed because of whiners.