Is "RAMBO 5" Now Not Happening?

Sylvester Stallone has reportedly announced that he has officially cancelled all work on "RAMBO V". There was news that he was to start filming in Mexico later this year for the next film. Now he's had a lot of idea's for the fifth film, but no one really knows which one he was going for. Some rumors were saying that Rambo was going up against Universal Soldier type characters. The other was he was going against terrorists who were killing off men and women in Mexico.
And the other rumor was that he was in search of his daughter, who was kidnapped and taken to Mexico by a group of men. I really liked the fourth film. It was very successfull with the fans and the critics. It was so realistic and that's what made it so awesome. The way the fourth film ended was good and if there deffo isn't gonna be a fifth film, then the way it was ended, was really good. He went home.......