Apart from a new tale of love and family, fans are on tenterhooks for "Frozen 2" for the new music. The original blockbuster film's hit "Let It Go," sung by Idina Menzel, easily became a cult favorite but the sequel is poised to top that success.

According to reports, lead characters Elsa and Anna will be singing a duet that fans definitely won't forget. In fact, this song is set to be the most popular one in the movie that will match, if not top, the feat of Menzel's tune.

"I think they'll definitely try to position one song as a 'Let It Go'-trumping central number. At a guess, though, it might be a duet between the sisters," Telegraph film critic Tim Robey said about the expected song number in "Frozen 2."

The song will also allow the sisters to be closer than they ever were. "They only shared about four scenes in the first film, so I feel more detailed development of that relationship has got to be the way to go," Robey went on to say.

Meanwhile, film critic Robbie Collin believes that Anna will be in the spotlight in "Frozen 2." With Elsa behind the song that made the first film more unforgettable, it is only right that her younger sister gets to enjoy her shining moment as well.

At the moment, there is no information about this mystery song although it will certainly be the one that fans will look forward to and will be on the lookout for when they watch the upcoming movie.

As for the plot, "Frozen 2" is rumored to reveal more about the death of Elsa and Anna's death. Word is that they have a baby brother "raised by gorillas." Co-director Chris Buck likes to think that the sisters' parents did not die in the boat as seen in "Frozen."

They were washed up in a jungle where they lived the rest of their short days and had a baby boy named Tarzan. While this is unlikely to pan out in the sequel, Buck points out that it's always how it was in his head.

"Frozen 2" is slated for a 2018 release.