Will there ever be such a thing? I've looked everywhere and haven't seen any mods for it, but I saw a lot of requests. Is it true it can't be done yet because the Dawnguard source code hasn't been released yet? Also, has Bethesda said anything on this?

Dawnguard source code...?

Unless I'm horribly mistaken about gamesas's means of creating and releasing content, Dawnguard's "Source code" should've been largely packed within the most recent CS editor as well as the BSAs that came with the DLC. Someone *may* need to create a 3rd party program to access the parts that we can't get to, but it's not a different enough part that would require a seperate source code to work properly.

... right?