systemd is now in Debian Experimental (http://people.debian.org/~stapelberg//2013/07/20/systemd-204-in-experimental.html)
I already had systemd 44-12 and udev 175-7.2 on my main Liquorix machine
I ran the following and booted everything successfully with no issues as of yet
sudo apt-get -t experimental install systemd
sudo apt-get -t experimental install udev