Not holding my breath...
We already know that CA are willing to use unethical/illegal means, by their own admissions, so who is to say that justice will be served, when the people behind this could very well blackmail/bribe the people who are going after them. They have data on millions of people, no doubt including people from the ICO, Judiciary, MPs and more!
Interestingly, Wikileaks was approached by CA (in an attempt to get at Wikileaks' data) in December last year, but Wikileaks said no.
Yeah, Cambridge Analytica could be the sacrificial pawns, but what about the people/governments who used their services? I'm not holding my breath that people that need to be imprisoned will ever see the inside of a jail cell...