Are you Shpongled?
How is WVW part of the LS ?
Season 1 of WvW starts October 18th and goes for seven weeks. Once that is over, Season 2 will probably kick in. So in that way it is part of the evolving living world in that it isn’t a static event / set of achievements. The achievements are around for the duration of Season 1 then move on to give way for the achievements of Season 2.
Basically it all boils down to the fact that the WvW Season is a temporary event that lasts for ‘X’ amount of time before giving way to the next Season.
Ah it’s classed as Living World rather than living story. Sounds pedantic, but it fits better under that category than as you say with living story.
Also, there have been calls for more pvp LS/LW stuff, so this also fits with that.