Euro Truck Simulator 2 is headed to the Baltic states in next expansion

Glide through Latvia, Lithuania and bits of Russia, including Saint Petersburg.

Euro Truck Simulator 2's next expansion will let you ease around the bends of the Baltic states, developer SCS Software has revealed. The DLC will include the whole of Latvia, Lithuania, and Estonia, parts of southern Finland and a section of western Russia, including Saint Petersburg.
The team did not mention a release date for the expansion, provisionally named Beyond the Baltic Sea, so I wouldn't expect it imminently. They have "quite a lot of ground to cover" and the DLC will end up feeling "very different from the rest of the world we have so far", SCS said in a blog post.
You can see a map of the region that the expansion will add below—it's the purple bit.

Saint Petersburg is a particularly beautiful city, and I'm looking forward to seeing how the team handles its extravagant architecture. A lot of the expansion will be hours and hours of countryside, however, and you can see some screens of that below.
The game is slowly building up its reconstruction of Europe, having added the cities of northern Italy in December.