Now you guys remember those destiny trading card codes. What do you think these codes will get you? Will they give a weapon like red death. Or possibly emblems, shaders and/or armor that will be exclusive to that card and corresponds to the actual card? Tell me what you think and they said that they will tell what these cards will do closer to the release. Have they told us what day?
They've been revealed as Grimoire Card Progress. If you go back to your codes sections through a web browser, you have the option to redeem them. They will apply to any online authentication (PSN/XBL) that you have linked to your bungie.net user profile.
To be honest I think they will give grimoire cards for in-game. But before you think that stinks realize that grimoires can give you in game bonuses.