The other key labeled Heavensward:CE or Standard depending on which version can be redeemed on the 19th. It says all the information here.

http://eu.finalfantasyxiv.com/lodest...95f8041f8179ea

What it doesn't say it how to view the keys.

Right click your game, and CD key is the option to click.

This may no apply to the OP but i thought id put it here for others.