Could it be linked to BTC-e takedown and the arrest of the operator?
Main charge is money laundering, Bitmixer could be connected to BTC-e or even operated by the same people.
It's possible but unlikely, why they would take Bitmixer down? to hide their tracks? It's impossible for them to know that the owner will get arrested so It won't make sense but BTC-E case will definitely reveal a lot of secrets I'm sure. It's already all over the news sites, It seems like the owner was the one who actually hacked Mt.gox and made BTC-E exchange to hide his tracks. Who would've thought?