99485 members on this forum and we can't even get a compelling answer to question 0: Is this a real attack or just exponential traffic growth?
(Personally and from what I've gathered from several webmasters this does look like an attack... but I want proof, not opinions).
Gox said 4 hours ago on their twitter feed that this was a DDOS. Or are you suspecting that Gox is lying about that? If so, the only people with access to this "proof" you want would be Gox, SoftLayer, Prolexic, or the person actually doing the attack.