According to reports by Finnish tv channel MTV3 Madonna seems to be confirmed for a show in Helsinki, Finland.
Jätkäsaari, the rumoured venue, is a former dock area in the city with a capacity up to 80,000 people that would be used to organize a live event for the first time. If this materializes, it will be the biggest concert ever in Finland. MTV3 reports that an official confirmation is expected in a few days.

Source: Madonna Tribe