The most recent Vapor Cage 4 has not been anywhere near as well received as the Air Zoom Cage 3. So it would be a safe assumption to say that Nike will phase the cage 4 out quicker than the cage 3. Foot Doctor Zach (Tennis Player, Foot Doctor, Tennis gear reviewer) posted a video citing a good possibility that the Vapor Cage 5 or Cage 5 will be coming sooner or later. Does anyone have any info on the shoe? I loved my Cage 3s, the 4s are just so much more heavy and frankly unusable, and the Vapor Pro doesn't have the durability that the cages do so I would love an update to the cage line. Cheers!