The leak is here.
First announced on reddit
[Ed. addition]
What is the TTIP?
It's the Transatlantic Trade and Investment Partnership.
TTIP is the biggest free-trade agreement ever, it's being discussed for quite a while now between Europe and the US. The discussions have been critizised for their lack of transparency and a lot of people fear that industry regulations will be lower after the agreement diminishing rights of citizens. Since the outcome will affect 820 million people, we're investigating it.
https://en.wikipedia.org/wiki/Transatlantic_Trade_and_Investment_Partnership
According to the reddit discussion, a number of the documents have already been made public.
[Ed. update: Typo fix and revised the link to the correctiv.org web site to point to the English version; removed text pertaining to the German version.]
(Score: 3, Informative) by fritsd on Monday July 13 2015, @12:59PM
paragraph 2:
"We want to elucidate. And that's why we are publishing, under #openTTIP, a lot of confidential documents that we obtained.
Those point out, which states represent which interests, which questions are heavily under negotiation, or which side is blocking [which issue -tr].
Many worries from TTIP critics are also shared by some governments."
I translated "heftig gestritten" as "heavily under negotiation" ;-)