User blog comment:IamJakuhoRaikoben/Chapter 415: And It Shall Become Your Will To Live, Review./@comment-5303512-20150115213125/@comment-7418318-20150116084239

Natsu's biologiacal parents' identity or at least his age?

The circumstance of Layla's death?

Lucy deciding to learn another kind of magic to better back her Spirits up and be less vulnerable to having her keys stolen?

Sagittarius taking the shape of a Centaur instead of a man in horse costume?

Juvia stopping to be annoying (as in showing her affection normally instead of this totally over the top way of hers)?

Gray dying for good?

The shocking reveal that the final partner of Lucy is going to be Levy? I think I'd laugh myself unconscious if it turns out that the final pairing will be Lucy+Levy (remember the "naked ass" comment waaaaay back in the beginning? Or the overenthusiastic welcome hug at the return from Nirvana?) :P