Summary: Everyone received 1 year in prison. They plan to appeal, which means the final verdict could take years. The website and tracker are staying up.
Not only that but they are only four people of a much larger swarm maintaining the pirate bay. Even if they go to jail it wouldn't mean anything to the site being up or not.
I think this what is called being a "scape goat" - perhaps under political pressure, the courts are deciding to make an example out of them.
If jail time became the norm for running torrent sites/trackers, those who have the know how to put these things online will be more deterred than if the penalty were only financial loss.