According to the official website, the third season of Nodame Cantabile titled "Nodame Cantabile Finale" will be aired from January 2010. The final chapter of the series was first announced to be aired this autumn.

Staff
Director: Kon Chiaki
Series Organizer: Nakajima Kazuki ("Tengen Toppa Gurren Lagann")
Episode Script Writers:
　Yokotani Masahiro ("Maria†Holic")
　Ohnogi Hiroshi ("Fullmetal Alchemist: Brotherhood")
　Yoshida Reiko ("K-ON!")
　Maruo Miho ("Saiunkoku Monogatari 2nd Season")
Character Design: Shimamura Shuuichi ("Nodame Cantabile")
Production Studio: J.C. Staff

Source: Nodame official website
Related topic: Manga Author of Nodame Cantabile Hospitalized Due to Acute Appendicitis

Update: 2009.07.19

Tomoko Ninomiya has mentioned on her blog that Nodame Cantabile will resume publishing on the July 25 issue of Kiss. As of now, manga will end to coincide with the spring 2010 premier of the final live-action film.

Story by adamantine
Source ANN