Halo 4 IS real or a rumor

Anyone see an article about Halo 4??? I read one about it but loss connection and I do not remember how I got to it. Although we have come to believe that halo 3 is the last part, the halo 4 story seemed to check out with the other storylines. It states that you will finish the fight in halo 3, BUT to be more specific, you will only finish the fight with the covenant.