Hackers with lots of documents not seen before, to release, for a price. It seems they were doing a crowdfunding thing (using Bitcoin I think) so they didn't have to have just one person pay their fee. As long as they got X dollars from multiple people, they would release the documents. Actually they were releasing the encrypted documents in batches, and when they got their fee met they would release the document keys. So batch 1 had a cost and not so juicy documents, batch 2 had a higher cost and more juicy documents, etc.