I did a little investigation and found the release dates of the last 3 episodes of Karas.
August 24th: "Nin otsuhane" 「人 乙羽」
September 28th: "Gensouku" 「幻想区」
October 26th: "Makoto densetsu" 「真 伝説」
Source: http://www.tatsunoko.co.jp/Karas/top.html
No idea if this is known already, thought I'd share it
Karas 4, 5 and 6.
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