I don't think people like to talk about it much but I'm sure there are poeple out there with the same question as you. Looking at the questions,
A) The big hack was a hack of the forum that took place sometime around mid December, I believe, 2010.
B) Supposedly Veb.
C) The post Veb made was bagging out hamp but we will never really know if we was hacked or was just butthurt about something.
D) Just tighter security. No-one that knows exactly will release this info however.
E) I'm not sure of the specifics. What I believe happened was that the hacker did something to that databases. The forums were so badly mangled, that hampa resorted to a backup from June/July that year (I think). This meant that the forums were exactly as they were back then. Meaning that banned people were unbanned, accounts which were mader after June/July ceased to exist, people were in different clans, items were in weird places, users had the same passwords as they did back then, staff with usergroups which they obtained in the period between the backup and the hack didn't have them anymore etc...
Basically, everything that was created or that happened between the backup and the hack was completely obliterated. It was pretty nasty...