The As Goes Light, So Goes Darkness promotional website can be found at:
The full Patch 3.15 notes can be found at: http://na.finalfantasyxiv.com/lodestone/topics/detail/86c483a5b15766c988ee8db15f4eda117b9d66e4.
FINAL FANTASY XIV: Heavensward is available on the PlayStation®4 and PlayStation®3 systems, and Windows PC for $39.99. FINAL FANTASY XIV Online, the all-in-one bundle that includes both A Realm Reborn® and Heavensward, is available for $59.99. A free 30-day trial is included for new FINAL FANTASY XIV accounts, with monthly subscriptions starting at $12.99. The FINAL FANTASY XIV community now exceeds more than five million adventurers worldwide.
For more information on FINAL FANTASY XIV: Heavensward, visit: http://www.finalfantasyxiv.com/heavensward/.