They also operate a policy of only releasing information that has been heavily nailed down. So high-end PvE, competitive PvP, the informal World vs World (vs World, the matches have three sides apparently) are still in flux, so they won't be releasing info.

And yeah Oric's link is a good place to learn the lore, and the article below also gives a good summary of what happens in the 250 years between the two games, though it was released in like 2007 so some parts have probably changed.

http://wiki.guildwars2.com/wiki/The_...t_of_the_World