Released on the 4th, it is available through the Win10 update app but most folks will want to grab the ISO. You can do that via the media creation tool (http://go.microsoft.com/fwlink/?LinkId=691209). The ISO’s are also available via MSDN
What’s in it for the Enterprise?
The best article I’ve seen so far with a great breakdown on the security aspect is from: https://www.askwoody.com/2016/new-statement-about-win10-1703-creators-update-corporate-security/. His references are posted in the article.