We are seeing many of the DNS issues responding normally as of 1PM CST. Zerigo is still fighting the DDoS attack, and some geographic areas may unfortunately still be down.
I want to personally apologize for any inconvenience this has caused, and also thank everyone for their patience and understanding. We’re doing everything in our power to find solutions for our customers so you all can return to business as usual building amazing things with WordPress.
If you have questions or concerns, feel free to create a support ticket, wpengine.zendesk.com, or send our support account a tweet, http://www.twitter.com/wpesupport. We’re here to continue providing top notch support while Zerigo resolves the DDoS.