It has been revealed, though unofficially, that an anime adaptation of The Disappearance of Nagato Yuki-chan is currently in production. The news was revealed visiting the Haruhi website via an android device. The anime has been reported to air in April 2014. Additionally, another series titled The Jump of Asahina Mikuru will also air during that time. Information on both these anime is scarce.
The Disappearance of Nagato Yuki-chan is a spin-off manga in The Melancholy of Haruhi Suzumiya franchise, where it stars the eponymous character Yuki Nagato. The series takes place in the alternate universe established in The Disappearance of Haruhi Suzumiya. The series is written and drawn by Puyo, which started in February 2010. To date, the series has a total of 5 volumes with the 6th volume releasing on December 26th this year.
There is very little information regarding the anime announcement of The Disappearance of Nagato Yuki-chan, including whether or no Kyoto Animation will produce it. Two other spin-off manga were also produced into anime: The Melancholy of Haruhi-chan Suzumiya and Nyoron Churuya-san.