To them (and us) to shorten the waiting time until the DVD release, I bought the radio play, and it was a great success. You will hear nothing more, citing other whenever it comes into their minds. And the songs are sung at every turn.
The secret star of the whole is the snowman Olaf, which is spoken by Hape Kerkeling just so cute.
Whether the radio play is just as great even if you do not have the images from the movie in my head, I can not judge. But with the film in advance, definitely a buy recommendation.