Picture for reference.
Defiant map pack was done by Certain Affinity
CEA graphics rework was done by Saber Interactive
CEA music rework was done by Skywalker symphony
Anniversary map pack was done by Certain Affinity
Halo 4 forge was done by Certain Affinity
Halo 4's CGI cutscenes were done by Digic Pictures or something
Majestic and Castle map pack were done by Certain Affinity
Spartan Assault was done by Vanguard Games or whatever it was called
So will 343 develop Halo 5 by themselves or will there be stuff outsourced like there already has been?
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343 didn't have a full compliment of 300 employees during Halo 4's development cycle, they had to build as they went along. It was only after the game's release that they hit the 300 mark, so now they probably will craft the game more independently.