Well, Three of those codes are One for each class, so that shows itll be a vanity item.
Then Three other codes are Two Exotic and One Legendary weapons so we'll probably get those as actual use weapons.
Four codes are One place on each planet, so itll probably unlock a special place we can access.
As for the Creature codes.....thats an outright mystery.
I guess it does make sense but doesn't it sound a bit too much? Specially the weapons which were a reason many people didn't want a Beta transfer.....But it does make sense, and I think the creature codes might be some loot from them? like..................you know, things they drop XD