I lack the background knowledge about Afghanistan and Pakistan to put the new information in full perspective, not to mention lacking the time to read more than a little of the vast data dump. Therefore only these points about the still-emerging significance of what's now on public record:
1) "Everyone" knows this already. People who have been very close to this story say that little of the information is "new," in a fundamental sense. See the Atlantic Wire's summary here, Mother Jones here and here, and (splenetically and amusingly) Andrew Exum here. Fine.
2) But not everyone actually did. Notwithstanding #1, information that may be old news to insiders may seem a revelation to the broader public. Whether from George W. Bush or Barack Obama, presidential speeches about Afghanistan have not emphasized the mixed loyalties of the Pakistani security services, the frustrations of dealing with tribal leaders and corrupt officials, the extent of civilian casualties, and other items that, according to insiders, "everyone" already knows. At this stage it's impossible to say whether a vast, somewhat hard-to-digest compilation of raw reports, released in the middle of summer, will mean that "everyone" in a broader sense comes to share this insider perspective.