I'll update what I last talked about with Joakim Stignert. He is one of the lawyer in the group action.

You more people that will join the group action, the better it is for each of us. The interest are really high, especially by the amount from USA and Charlotte Lin.
Consider that, the risk are really low. They will tell the amount of participators so that each of us can make our own estimates of the risks. BUT the cost of the trial(s) should be "normal", so KnC can't get 10 lawyers and think that we will pay that if they win.
They make an estimate that at least 50 people will join the group action. If KnC loose and appeal and wins in the supreme court (first district court and if they loose and appeal they will go to supreme court). And if we count really high, let say KnC sends an invoice of 400 000 sek our cost per person will be 8000 SEK (400 000/50 = 8000 SEK or in USD $50 000/50 = $1000). And that is worst case.

They can't sue any of us because their name or their brand or any thing like that got poorly treated.