The documents were previously released online by the collective known as Anonymous but they were only available via bittorrent.
The complete collection of Scientology's Operating Thetan levels normally cost hundreds of thousands of dollars to access by working your way through the Scientology system. The Church of Scientology denies the information exists, but the authenticity of these documents can be verified by any former OT level members of the Church of Scientology such as Jesse Prince (former No.2 of the 'Church'), Michael Pattinson (OT VIII), Tory Christman (OT VII) and 10 year Scientology member turned renowned critic, Arnie Lerma, who's home was raided at the bequest of the church of Scientology in 1995, to recover copies of the OT texts which had been legally obtained via the court release of them during the Fishman case.
Though these texts have appeared online before, they have always been rapidly hit with copyright claims and lawsuits by the church of Scientology, despite at the same time denial of the existence, or authenticity of the documents.
Older versions of these texts, versions of OT levels I to VII were once made available to the public for under 100 dollars as exhibits attached to a declaration by Steven Fishman on 9 April 1993 as part of Church of Scientology International v. Fishman and Geertz. The text of this declaration and its exhibits were collectively known as the Fishman Affidavit. These exhibits were eventually sealed by a judge after petitioning by the Church of Scientology, as their contents were worth hundreds of thousands of dollars per reader to them.
This is the third major Scientology leak on Wikileaks spawned by the Anonymous campaign against what it calls "the corrupt business known as the 'Church of Scientology'". Previously there was :
Citizens Commission on Human Rights exposed as a Scientology front Which holds proof of political lobbying that is in violation of it's 501(c)(3) Tax Exempt status
The 'Frank Oliver' documents as discussed on slashdot recently in Wikileaks Airs Scientology Black Ops"