It can't be a ballad...
another one no please!
I think it could be a rockish song, in the line of freaky and ningyio hime. I think that she needs a new one since she loves to do a "rock part" in her concerts and now all her rockish ones are kind of old. Ningyio hime is not performed anymore as a "main" rock song in her tours, and I think Freaky is going to take the same way, cause I doubt that she puts again the fire thing in that song and sings it again. Maybe part of a single meddley, but not as main rock song anymore.
So... I think that a rock song is what we should expect next
I don't know if anyone undestood what I was trying to say... hehehhe
-edit-
Oh! and Can we go back I think is a song just for one tour. Amazingly performed for once, but not a song it should be keep as a rock hit in her career, do you know what I mean?