This week Microsoft released build 15002 (hands on video) and 15007 (hands on video) for Windows Insiders on the fast ring via Windows Update but I know some people like to wait for the downloadable ISO files before trying the builds. Microsoft have released build 15002 as downloadable ISO files so you won’t get the exactly the latest build but do get the new Windows 10 out of box experiences. There are not that many changes from 15002 to 15007 but I have found 15007 to be a lot more stable.
ISO files are available for Windows 10 build 15002 and the older 14986 build. Download from Microsoft.com