In a news excerpt on Czech Television yesterday, it has become clear that Martina will be singing a song called My Turn for the Czech Republic in Kyiv and a short part of the song could be heard.
It appears to be a ballad and part of the choreography that will be in the video can be seen. See the excerpt here(Click!).

The theme of the song is reported to be the intimacy in a relationship. The fact that the people in the video (of different ethnicities, genders, ages, physical appearances etc.) are wearing very little is to express exactly that.

In an interview Martina has given before this one, she told that when she was one of the 5/6 people in the running to become the Czech representative, she got to choose between a song in Katy Perry fashion, written by the team behind last year’s ‘I Stand’ and a song by a British team. She chose the latter because it suited her voice and style better.

The entry is expected to be released later this month in full.