The autopsy report is also to be released soon. As for what the funeral director said, he said there was no signs of a scuffle, but did say he was not a medical practitioner, that it was based only on his experience.
On a tv interview, he also mentioned that he did not see any visible exit wound, which would be strange if shot at point blank range.
link to funeral director report:
There are also news of witnesses supporting both Zimmerman and Martin, and due to the conflicting witnesses, the accountability of witnesses may be dismissed in the case or prolonged before used.
links to both sides:
http://www.dailymail.co.uk/news/article-2120096/Trayvon-Mart in-case-Friend-Zimmerman-identifies-Neighbourhood-Watch-capt ain-screaming-help-911-call.html
The one witness on the Zimmerman side (did not really see anything, just heard)
And the other who saw
There are reports though that the 13 year old witness may be lying since he has messed up in his story through interrogation.