Anon are targeted by governments as they don't like what they are fighting for, it may have been them who hacked Sony but who knows. Arresting 3 guys is not going to effect anon in any way. Anon fights for some good causes that I certainly agree on, the internet should not be censored in my book, if someone is distributing cp then arrest them but don't put draconian measures in that effect the rest of the internet. Cough cough iwf.
Chances are, they will say that their wifi was open or they can't prove it was not cracked and there won't be enough evidence. An ip !=a person.