This is a video from the City Planning Department of the City of Helsinki, where you can see the really ambitious projects that are planned to expand the city. Some of these projects already started.
A screenshot from the video:
To understand these projects in an historic context check out the next map. It’s fascinating to see how the west side of the capital (Ruoholahti -Jätkäsaari ) has grown, and by 2030 will almost double its size again.