Bungie doesn't have a next game. Halo 4 and Halo CE: A are 343 Industries. Bungie is (unfortunatly) not making the Halo series anymore.
Halo 5 is one of the other announced Halo sequels set to come out sometime in 2014 - 2016 , along with Halo 6. Look it up here on the Wiki.
BUNGiE's next project is called/codenamed Destiny, and it is an MMO First Person Shooter- Source: 1up. Com