Looks like whitelisting may have begun; a good chunk of my miners at my primary location are back, but alternate locations (and thus IPs) still showing down.
UPDATE: we have been experimenting with various ways of mitigating the attack. A portion of all users is now able to mine again, but network congestion from the attack could degrade performance. If you are experiencing dropped connections you are advised to use a backup pool for now.
If you cannot connect, it will probably be at least 8 hours before you can mine on ABCPool again.