the newest gun is the stampede retard
it is called a Vulcan, it's like a chain gun.
As Hasbro has no plans of closing the Nerf brand, it is unknown when the last Nerf gun will come out.
As of Feb 15, 2010- The only 2010 Nerf Gun would be the Longstrike CS-6 It is the newest and longest Nerf Gun created -gagdude
That would be the Nerf Hydra sg-7.
The newest N-Strike Nerf gun currently in stores is the Stampede ECS. The newest Dart Tag blaster will be the Sharp Shot, due to be released sometime in fall 2011.
The gun that came out on 09-09-09 was the Nerf raider.
As of Feb 15, 2010- The LongStrike CS-6
it is going to the Nerf raider Now it would be the Nerf longstrike cs-6, coming out in spring 2010
The current newest blaster is the Hail-Fire, released in September, although available in some stores by August.