mask.of.sanity writes "Kali, the sixth installment of the BackTrack operating system has been launched. The platform is a favorite of hackers and penetration testers and has been entirely rebuilt to become more secure, transparent and customizable. Metasploit too has been rebuilt to be more stable with an optional noob-friendly interface. Kali even works on ARM devices and comes ready to go for your Raspberry Pi."
The big new feature is that it's been repackaged as a flavor of Debian, instead of using their own custom packaging magic.