Answers.
The problem being though, I don't know what answers I want. Part of the allure of Dark Souls is the mystery and the "come up with your own theory" that fills the game. Giving you just enough info the piece the overall story together, but still leaving enough up to you.
But when this is taken away, the game loses a lot of it's charm. An example would be The Sun's First Born. While I won't go into detail (since you have yet to play the game), there are events in III that answer some questions about this missing god, and in doing so, peels away a lot of said god's fan-power.
That being said, here are a few things. Minor spoilers I suppose.
1) I want to track down Velka. Maybe not meet her exactly, but something. Out of all the gods and goddesses, she's the second-most mysterious (first place goes to Fina, and bonus points if you know who that is).
2) I want to know more about all these children of Gwyn. I was under the impression that he only had three, but apparently there are a LOT more out there. Are they really all his children? Is this Zeus basically, or are they adopted? And what happened to the "Legendary Chest" Gwynevere? I know she ran off and married, but what about after that? It's been implied that she's had some kids, but I still want some more info on this final of the original three.
3) Spinning off of that, who gave birth to all of these children? Ever notice how we've never heard of a mother for any of them? Why is that?
4) I'd like to find out what happened to Priscilla. I like to think she's the mother of Yorshka, but I don't know. Plus, there are hints of her in the Ashes DLC, so I'd like to know where she is or what happened to her.