Windows Insider members in the Fast ring got to download the Windows 10 PC Insider preview build 10565 earlier this week, Now, the Insider members on the Slow ring can download that same build as well.
Windows Insider head Gabriel Aul revealed the launch of build 10565 to the Slow ring via Twitter. This is the first such release for Slow ring members in quite a while. This launch also follows Microsoft's move to release ISO files for build 10565 as well. The build includes some new Start menu features, a way for Cortana to recognize handwriting and much more.
Source: Gabriel Aul (Twitter)