An official announcement of the existence of Crysis 3 is about to emerge, it would seem.
Eurogamer has gathered a veritable bounty of evidence for the reveal, which began with the cover of Swedish magazine Game Reactor. Although it doesn't name the game specifically, the visuals and tell-tale Nanosuit pattern are a clear indicator.
The site also found reference to the game on EA's digital portal Origin as well, amazingly, two branded images from a simply Google image search.
These depict the classic Crysis protagonist holding what appears to be a bow and arrow in an urban setting.