In a recent leaked transcript of a Activision meeting it has been confirmed Activision plan on only releasing games with cliffhangers.
This idea apparently first came to mind after Infinity Ward elected to make a new game rather than continue with Ghosts. It also supports the possibility of CoD:WW2 being released this year so that Advanced Warfare has ended on a cliffhanger. The reasoning behind this is so that CoD can have multiple stories ont he go, so that if one gets boring the company can pick up off of a different one that hasn't been used in a while which will have likely gathered support and hype for it to be successful and most desired at the time.
Further discussion goes on to discuss the future of supply drops, and some have suggested adding DLC in to the supply drops to make them more lucrative.
Some time after being leaked, the log was taken down. The believed leaker was an intern called "Pilar Olofs".