In the live streaming program of Mobile Suit Gundam 00 The Movie, director Mizushima Seiji leaked that Nagasaki Kenji (the assistant director of Mobile Suit Gundam 00) is working on the storyboard of Kimi ni Todoke. No official announcement about new anime of Kimi ni Todoke has been made so far.
A live action movie of Kimi ni Todoke will be premiered on September 25th.
Source: Archive of Gundam 00 Live on UStream (19:50~20:00)