Well I'm not entirely sure, but I would love to see another Call of Duty game because they are just so good. Also, if they do come out with a new CoD then it won't be for a while because the forth one just came out recently.
there will probably put a lot more perks on, and they will take out a lot of the glitches, like the one where you will be playing a game (with full connection) and it says at bottom that you are losing connection and it boots you out.. they will probably make a lot more stuff for sniping too.
idk if there will be a call of duty 5 but i hope there is because call of duty 4 wass crazy but it couldve of used improvment anyways to answer your question there probaly wont!
They confirmed that its gonna be call of duty 5, when call of duty 4: modern warfare came out. Like a week after, cauze they liked to make the game, so.. just wait a year or something...