This image release contains updated packages from the previous release, including packages from the Debian 8.1 and 8.2 point releases and a new ev3dev kernel (v4.1.7-7-ev3dev-rpi2).
Note: If you have already installed a previous rpi2 image, you
don’t need to install this new release.
sudo apt-get update; sudo apt-get upgrade; sudo apt-get dist-upgrade
is (hopefully) sufficient to get all of the changes.