It has been confirmed that Neversoft will be the next developer to try their hand at the Call of Duty series. There have also been some detail leaks that point it to being Modern Warfare 4. Supposedly a source from Neversoft leaked the following information
“It’s another MW game. There’s something called, ‘Drone Survaillance’ [sic]. They’re working on ‘HALO’ jumps (High Altitude; Low X.) There is a level under ice. There is cloaking tech. Something called a ‘Dominator UAV’.”
Like most game industry rumors, Activision has yet to comment. We will likely get more information on Modern Warfare 4 next year after Black Ops 2 releases.