Since I haven’t seen a post about this, here it is for anyone that hasn’t checked the dev blog yet.
I’ve got to say this bit:
“We’ve been hashing out some really cool ideas for a living storyline that will actually change the game world in significant ways as the game progresses; can’t wait to write about that in a future blog post.”
has me so excited. I love it when stuff you do in a game, especially a MMO has an impact on the world.
All I’d say regarding this, is don’t worry about doing too much, and don’t make it a story with an end. I would love to see events done by players become part of the lore new players read 
. Make it so the world can change according to our actions, in real and big ways (and also the lore 
). But in such a way that people who join the game at a later stage don’t feel like they’ve missed out on 90% of the game (i.e. make the story ongoing, not something with a definitive end).
Oh, yes and if Aaron and/or Nick read the Community Blogs, HI!! 
.