There's plenty of clues about what the Skyrim DLC may be about buried in some Skyrim patch filenames.
Dragon mounts, Morrowind, and Daedrics, oh my!
These are just a few of the wild rumors floating about on the Internet about what Skyrim's DLC could be about.
However, a BethSoft forum user found some concrete evidence as to what the DLC's contents could actually be after scanning the Skyrim 1.5.26 patch files, revealing the following filenames (among others):