It's a 200+-page document plus "a variety of donor registries and other strategy files, 'just a few docs from many thousands I extracted when hacking into DNC’s network,' the purported hacker claimed over email, adding that he’s in possession of 'about 100 Gb of data including financial reports, donors’ lists, election programs, action plans against Republicans, personal mails, etc.'"
The enormous opposition document... appears to be a summary of the Democratic Party’s strategy for delegitimizing and undermining Trump’s presidential aspirations—at least as they existed at the end of last year.... A section titled “Top Narratives” describes a seven-pronged attack on Trump’s character and record.... “Trump has no core”... Trump is running a “divisive and offensive campaign”... Trump is a “bad businessman”... Trump espouses “dangerous & irresponsible policies”... Donald Trump is the “misogynist in chief”... Trump is an “out of touch” member of the elite... Trump’s “personal life"....Here's a second Gawker article, basically laughing at the weakness of the material, including the ludicrous problem that Trump has flip-flopped on Heaven.
It appears that virtually all of the claims are derived from published sources, as opposed to independent investigations or mere rumor. It’s also very light on anything that could be considered “dirt"....
You can read the whole dismal document at the first link, where there's also an update saying that the Trump campaign has taken the position that the DNC somehow hacked itself, deliberately putting this file out there as a distraction.