User blog comment:CNBA3/Fairy Tail 411 Review/@comment-7418318-20141201122317/@comment-4829046-20141201130812

The moment I saw the MP cover translation, I stopped caring out of amusement cause I had never seen such a thing in my life.

I also believe it could be foreshadowing, since he NEEDS horns in the final stage of Dragon Force, but the Demon part could also hold true. Either way, Natsu with horns is something Mashima likes to muse about.