The development team of debian distro . The name of new version i.e. named as Debian Stretch. The name of this distro is named upon the Toy Story's character who is an octopus. All the names of Debian distros are named upon the characters of toy Story.
There are many new features in Debian Strecth i.e.
new digital forensics tools
GNOME 3.22
Linux kernel 4.9
default MariaDB, etc.

You can check more of it from the link
[url="http://technicalbudd.com/2017/06/debian-upgrade-jessie-to-stretch"]Debian 9 Stretch GNU[/url]