Just confirmed yesterday that an unaired route of the popular winter 2010 anime is coming on February 22 (JST)!
It will be available for free on Nicovideo for both PC and iPhone/iPad beginning February 22 at 12pm and will be available until March 8.
It will also be available on the anime home page, presumably around the same time.
The story will reportedly branch off the final episode, where Kirino asks Kyousuke for “one final request”.
Looks like us folks based outside Japan can’t view it for the time being. You can always wait a day or two for it to hit websites to download.