Obviously I'm quite skeptical, but the first time I saw the Dawnguard photo I noticed how the arrows were something that didn't need to be there. Any other time we saw our Skyrim poster boy he didn't have a quiver (or at least I don't remember him having one) I decided that I was going to look at the arrows in game and maybe do some research in crossbow bolts, to see if those are in fact arrows in game or maybe bolts. I never did get around to doing this and really dont have the time right now. If someone decides to do this please share your findings with us all. To me it just kind of seems like a hint from Bethesda, just like the glowing eyes we don't get it but it will make sense when we get the DLC