Their site is down. Can someone post the magnet link?
EDIT found the link on reddit: magnet:?xt=urn:btih:66fc47bf95d1aa5eca358f12c70af3ba5c7e8f9a&tr=udp://tracker.kali.org:6969/announce&tr=http://tracker.kali.org:6969/announce (torrent at http://images.kali.org/kali-linux-2.0-amd64.torrent)