Instanced or one time events?
There has been no official word, but smart money says it will be instanced. We haven’t had any large-scale, one-time, open-world events since (I believe) the karka invasion during Lost Shores last November. That was such a lag-fest, attended by complaints from people who missed it, that something like it hasn’t been attempted since. Living Story components since then have either persisted in the world for a bit, or been available as instances for the duration. So go enjoy your vacation, and try to avoid spoilers!
For the Coast!
There will not be a one time event in the next release.
Yes, we have a official awnser already.
Thanks guys!
/15char