I think you are right, there's a massive attack underway on servers globally, with a ton in the US targeted. More than 90,000 distinctive IP addresses are attempting to brute force admin credentials, and a quite a fair percentage succeeding.
From an Ars commenter "According to Matthew Prince - CEO of CloudFlare - the botnet can attempt 2 billion different password combinations in 1 hour."
Here's the link to the article --the comments are extremely interesting:
http://arstechnica.com/security/2013/04/huge-attack-on-wordpress-sites-could-spawn-never-before-seen-super-botnet/
This attack is slowing down the whole internet.
My company was hit the other week. I'm not pointing fingers but the created user accounts were in Chinese.
We all know how unhappy the Chinese government is with Apple so I think they could be behind it if it's a cyber attack.