Before this last episode (71) was released, I had this idea that probably Orochimaru is still the same old bad guy, and that he's planning something using Mitsuki as a tool (of course, Mitsuki has no idea and probably when time comes, at the end he'll choose not to be used, or be a good guy thanks to the friendships he has built).
Think of it- using Mitsuki to destroy Konoha again or something like that.
After watching this episode we can see ep 72 will focus on him, however I don't think my theory will come to place, I see it as a long term event on the Boruto series. But, who knows. What do you say?