Q: because cod4 is flippin sweet. Just curious.
A: Yes, there will be a COD5 but the development team is going to be Treyarch (made COD3) and not Infinity Ward (made COD2 and 4). It will go back to WWII and Treyarch will be using the same graphics engine as 4 used. The two development teams usually alternate years and sequels. General consensus is that Treyarch does not make games up to the same quality as Infinity Ward.