According to this Australian news report (and based on a report in a Danish magazine,) Queen Margrethe II of Denmark has a secret plan for later this year. She plans to abdicate in favor of her son, Crown Prince Frederik.
I take such stories with grains of salt because abdication is not a tradition in the Danish monarchy. It is a job for life, similar to marriage: death us until part. Frederik will succeed to the throne when his mother dies, and not before.