I want to point out that, with this leak, he has technically released a 'medical record', which he didn't do in his campaigns or while he was in office.
My experience in these many years of Clintoon watching is that something like this is leaked just before something that would be considered 'bad news' gets out.
The bad news is usually a companion story. In this case, we'll find out something (marriage in trouble, Chelsea's a drunk, etc) and then when we'd normally go, "Man, what a f**ked up bunch of people", the media will swoop in with the soothing reassurance that "they're getting help".
Make no mistake... you don't know anything about them that they don't want you to know...