Qubes R3.1 release notes

New features since 3.0

Management Stack based of Salt Stack in dom0 - documentation
Out of the box Whonix setup
UEFI support
LIVE edition (still alpha, not part of R3.1-rc1)
Updated GPU drivers in dom0
Colorful window application icons (instead of just colorful lock icon)
PV Grub support (documentation)
Out of the box USB VM setup, including handling USB mouse
Xen upgraded to 4.6, for better hardware support (especially Skylake platform)
Improve updates proxy flexibility - especially repositories served over HTTPS

Known issues

Installation image does not fit on DVD, requires either DVD DL, or USB stick (5GB or more)

Windows Tools: qvm-block does not work

Some icons in the Qubes Manager application might not be drawn correctly when using the Xfce4 environment in Dom0. If this bothers you, please use the KDE environment instead.

USB mouse (in case of USB VM) does not work at first system startup (just after completing firstboot). Workaround: restart the system.

It is advised to install updates just after system installation to apply bug fixes for (some of) the above problems