I don’t think anything outside the current UK - Germany - North America areas are likely for the immediate future. DTG have said this several times now.
Helsinki-Kirkkonummi U train (commutter train) Helsinki-Siuntio Y train (commutter train) Helsinki-Kauklahti E train (Commutter train) Helsinki-Lahti Z train Helsinki-Riihimaki R train Helsinki-Tampere (high speed Intercity Helsinki-Vaasa (high speed pendolino) Helsinki-Rovaniemi (high speed) Helsinki-Kouvola Helsinki-Jyvaskyla Helsinki-Oulu Helsinki-Turku Helsinki-Turku harbour There is some route’s