already several threads on this topic..here is one now:
http://www.mmo-champion.com/threads/...8#post41687828
its not confusing, Demon Hunters are the only class not getting access to the BS event on the 9th, due to their starting zone story happening chronologically at the same time.
demon hunters get one version of Legion intro (their starting zone) and all other classes get their version of Legion intro (bs event).
Demon Hunters will get the
option to go back and visit the Broken Shores event once Legion launches in a "lorewalkers" kind of concept.