Haven't seen anything on status.twitter.com about it yet, but seeing the following instead of a Fail Whale is a first for me:
Service Temporarily Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.
Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.
Nothing a quick reload wouldn't fix (for now). But still...