This is my no means a very scientific method, but Certain places I have gone I just get a "Bad Vibe" for lack of a better description,and I don't return to them. Pirate bay is on of those places. I am not a superstitious person I attribute that vibe to my mind just putting together all the little clues and making my careful mind uneasy on a subconscious level. Places like TPB, and ISO hunt have historically been prone to poor uploads whether they be due to virus or just crap material like a DVD Rip that has a guys head in the middle of the screen and talking around you. You know what I mean those new crappy cam DVD Rips.
Anyway since the founders of TPB were put in jail and the site was bought by an investment group, yea they are a corporate owned site now, they are probably safer now than ever in terms of anti-piracy groups. I haven's heard so much as a whisper of any investigations or take down notices against TPB since they went Corporate, apparently the rules are different for investment corporations than they are for individuals.
All that to say that it is more likely that, as was already suggested, some hacker just wanted his 15 min. of fame. I would guess it unlikely that he would distribute the information for profit as this could be construed as corporate espionage, felony theft, and a whole range of other charges carrying prison terms. The anti-piracy groups will likely distance themselves as well, forming an alliance with a known hacker for the purposes of gaining material evidence that would otherwise be illegal for them to collect would only weaken their position in court for on going, and future cases. In short it is to nobody's benefit to distribute the information, or even have any contact with it. Even the hacker that did this would be nuts to hang on to any material evidence of his crime against TPB.
I could see anti-piracy groups using similar methods just not in this case. I suspect they would want to be more quiet about it, for the reasons mentioned above. So I really doubt that anything further will come of this, with the exception of possible charges against the hacker.
Just my opinions on it.