Crysis Warhead - Crysis Sequel in the works?

According to Trademork.com: On March 3, 2008, German video game developer Crytek filed to protect the trademark Crysis Warhead in relation to “computer games software and electronic games” as well as a variety of goods and services typical to a game and entertainment franchise.

Interestingly, Crytek also filled for World In Crysis and Crysis Wars as trademarks an year ago.

via Trademork.com