In an informative post on the Guild Wars 2 forums, Colin Johansen has written about some of the upcoming plans the team has for providing free content to players. It is summed up very nicely by a statement that indicates that free content should be paramount.
We do appreciate that you’d like to buy lots of new content, but we’d prefer to give a lot of it to you for free, cause that’s what we think a responsible MMO company does!
Read more on the Guild Wars 2 forum.