I saying Finn will not start a new relationship in the next episode, but if he does the evidence seems to point to HW.

I Would Suggest Fubblegum.Because There Are Some Hints In Pajama Wars.

I'm not really sure, but if I had to choose I too would say Huntress Wizard, as the flute spell episode just begs for an follow-up. The thing is though that I doubt that huntress wizard will play a major role in this episode considering all the characters already revealed to star in the episode. What I would really be betting on would be an end-scene appearance of her muttering about how she wanted to go there. So that the writers show us that they haven't forgotten about the character yet.