after checking the bug page for something else, I found http://bugs.kali.org/view.php?id=464
This is very simple assuming you have a monitor. If you don't, just try to type as follow :
first wait 5 minutes to let the rpi to boot properly.
you will be prompted for the username and password.
root [ENTER]
toor [ENTER]
then you want to install the ssh package :
apt-get install ssh -y [ENTER]
wait at least 5 minutes if you don't have a screen plugged
then :
update-rc.d ssh enable [ENTER]
wait 10 seconds, then :
reboot [ENTER]
you should be good for the glory and power.
I did not tried without a screen those command, but that's what i did first to get ssh working on my rpi.