There is, we just haven't gotten to the gist of it yet... with the whole evil group lurking around trying to destroy Fairy Tail and it's chief. Especially Sieglein, Urtear, and his group, who seems to be after Natsu and Erza. It's been slow building, but I'm sure we'll get rewarded at some point. We got a bit of development from the Demon Island arc and from the aftermath of the Guild vs Guild battle. Many of the arcs we've seen in the past have been some sort of conspiracy from the Magic Council, so there's certainly something going on... we've just gotten very small pieces of the puzzle.