This is clearly CYA time for Sony. Today's message was essentially drawn up by their legal department.
Furthermore, people need to stop taking anything Sony says at face value. For the first 48 hours of this disruption they didn't even acknowledge that they'd taken the network down themselves.
The Sony story changes every day based on what they're legally obligated to share. It's the Japanese way of doing business.
On Friday, we might hear that all of our credit card information was definitely compromised instead of "some accounts" and "may have" and "we just learned 24 hours ago after our team of experts told us".
Next Monday, we might learn that all of the existing PSN accounts were wiped when PSN was rebuilt, online accounts will need to set up from scratch and existing trophy data not linked to offline profiles will not be able to be migrated over.
And next Friday, PSN might come up and we'll learn that none of our previously purchased content can be recovered. Whoops! Our bad. Our experts just found out. We were only legally obligated to tell you now.