Time for another 'do-release-upgrade'!
This took away dwm-tools and suckless-tools (amonger other stuff). This means that META+p does not work anymore. So you cannot start any apps. Just install them again with 'sudo apt-get install dwm' and you're good to go. Don't even need to restart anything.
Found this cool command to check what release you're on: lsb_release -d -s -c.
Maybe this only works on Ubuntu?