Apple:

In order to prevent a security threat like this from happening again, we’re completely overhauling our developer systems, updating our server software, and rebuilding our entire database. We apologize for the significant inconvenience that our downtime has caused you and we expect to have the developer website up again soon.

Names, email addresses, and mailing addresses of developers may have been accessed, but Apple doesn’t know whether or not the hacker actually did access them.

It doesn’t sound great, but Apple’s doing the right thing about it.