The defense wanted it released. Just as distorted leaks by the prosecution were tainting the jury pool against Zimmerman, making Zimmerman's injuries and first testimony to the cops public is one of the many factors neutralizing the damage done before, and is slowly destroying the prosecution's case. This information can't hurt if the case goes to trial, and may get it thrown out before then.
If you drag things out long enough, stupid people do get bored and go do something else.
Thanks.