The Equifax breach.
The Equifax breach dominated this week's news (The CyberWire). It's large, serious, and will have far-reaching consequences, not only for cybercrime, but for technology, policy, and regulation as well (New York Times). On Friday Equifax released a brief, relatively comprehensive account of their investigation so far (Equifax).
Extortionists claimed to have the stolen data and said they'd release all if Equifax didn't pay 600 Bitcoin (roughly $2.5 million) by Friday, but they seem to be just scammers (Motherboard). More serious criminals are expected to appear soon (Motherboard).