It seems as though the PSN store has revealed the title of the next Call Of Duty ahead of the supposed reveal:
It looks like the new Call of Duty will be revealed before Tuesday, May 3rd, if an alleged retailer document posted by games critic Jim Sterling is to be believed.
The document which is pictured below, shows the header boards used for marketing purposes, to replace the Star Fox header with whatever Activisions next Call Of Duty title may be.
There was no specific retailer mentioned where this originated from so like all leaks, take this with a grain of salt until officially confirmed. Generally though, Call Of Duty games are revealed around this time every year in preparation for E3.
Source: Jim Sterling