Kali Linux has now matured within two years, from its initial release. Kali Linux 1.1.0 has been on 7th Feb 2015, with more flexible Linux distribution, rich in security and penetration testing features on varied ARM hardware. For more please read this article Kali Linux 1.1.0 Realeased.
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Kali Linux Releases: http://kali4hackers.blogspot.in/p/kali-linux-releases.html