I know the answer might probably be the subject to very intense discussions in the coming days, as we are talking about 12000 pages, including 36 pages about the last days of the war. Ref here.
However, if a historian here has already taken a look at those pages, I would be extremely interested to hear the findings.
PS : I know this question might be against the rules, depending on how you look at it... being a mix between a "current event" (the release of the Records) and the end of war itself...
I think this is actually a temporary exhibition of some of the records in the form of a special exhibit. They will only be available until November and a person can only view the records for 50 minutes at a time. Hardly conducive to research. From my understanding someone who had wanted access to these annals could already request access to them by an application via the Japanese government's "Freedom of Information" act. In other words, I would suspect that anybody who would want access to these files for historical research has already accessed them.