This is going to have a mayor impact on Swedish politics. A new government is recently installed and this is the first mayor (public) opportunity for them to make a big impact on Europe from a sustainability, financial and political perspective. Expect A LOT faster result than 10-15 years.
It would be unconstitutional for a Swedish government to meddle in individual decisions of its agencies (including courts), and they in turn are required to act impartially.
Yes but the parliament can change the law however they see fit, to exempt this mine from environmental law. This has already happened twice in the last few years (cement production and hydro power).