Have you read your Grimoire Cards? They're filled with little snippets of lore and guardian legends and stories. It would be awesome to see some of that applied in game. But, these are a nice consolation prize. I just love them.
Have you found any notable Grimoire cards? I know I'm gonna be on the lookout for more Ghost Fragments. ^_^
EDIT: I just found a warlock card talking of the Ahamkara aka SPACE DRAGONS! Guys, not to get your hopes up but I think we may be seeing these beasties in the future.
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I highly suggest you find and look at the vex fragment cards. As well as the mysteries and legends cards. Those are really really good ones.