So what is Crysis Warhead? To begin with, it could be nothing. As the patent was filed by Crytek, and not Crysis publisher Electronic Arts, the German outfit may simply be protecting the name for some future potential use, similar to its patenting of Crysis Wars and World in Crysis in 2007, as noted by Trademork.
Bogus or not bogus?: Bogus that Crytek has announced Crysis Warhead as the title of any specific game. However, the trademarked title would fit for several projects, including a Crysis sequel or a console adaptation of the PC original.