Well, in case of 2014, Conchita had few songs to start with. They chose the best one based on what they have seen to be popular so far. A ballad was chosen, because it seemed to them that up-tempo song will not stand out in the semi-final. I suppose that's what it is good to wait and that is why some successful countries ( and ) wait so long to release their songs. Besides, someone could 'borrow' the idea.
Obviously it is not always the case. We don't know whether the song has been already made. We know the title and that Kaliopi is working on it. The title doesn't tell us much though. It may be a ballad or an up-tempo song. It may be a success or a complete disaster - but we won't know that for sure until 7th March.
Yeah, nothing of this is new. The things you say isn't making my hope higher unfortunately...It's just a way of wrap it up in cotton... A better way would have been to give us a song; like Italy. And then tell us that this song MAY be change to another one...