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There'll be a connection between Sickla Udde (L22) and Sickla (L25), about 700m of new track being built. However, they use different rolling stock and have different platform heights, so there won't be any shared traffic.
Blue metro T11 will likely connect and take over green T19's branch, while T10 goes to Nacka Forum and hopefully beyond.
The fare zones are likely going away again.