http://news.teamxbox.com/xbox/19041/Microsoft-Hiring-Game-Designer-for-Next-Halo-Game/

Frank O'Connor teases about new halo game!

Last year, a job posting in GamaSutra revealed that Microsoft was looking for a creative director for an unannounced Halo game. A few days later, Microsoft hired former id art director Kenneth Scott and his wife, Gearbox's Corrinne Yu. Yesterday, Halo franchise development director Frank O'Connor said that we haven't seen the last of Master Chief.

http://news.teamxbox.com/xbox/19032/Microsoft-Teases-About-the-Return-of-Master-Chief/