We've just wrapped up testing the hotfix on our internal realms and so far so good.
Everyone gets a complete Kirin Tor Emissary quest on login. If you are already logged in, please relog to get your credit.
This change won't be reflected in the UI until at least two world quests are completed and even then, there may be some inconsistencies. Fixing the UI is going to require a new build at some point but we thought it would be more important to get everyone their rewards! Hotfix should be applied to Live servers in a minute or two.