ex-Bungie next to 343 Industries

Unlike 343 Industries, those Bungie behind-scenes weren't used for marketing, they're only available in limited editions as bonus content. Most of those Bungie devs aren't working at the company anymore. 343 Industries rarely talks about development in those making-of videos, there's few explanation about anything in Halo 5 behind-the-scenes. If you want more you should watch the following sources below.
------ Sources ------
Halo 2 Behind the Scenes:    • Behind the Scenes Making of Halo 2  
Halo 3 Anatomy Of A Game:    • Halo 3 - Anatomy of a Game  
Halo 3 ViDocs:    • HALO 3 - ViDoc  
Halo 4 Making-of:    • Плейлист  
Halo 5 The Sprint:    • Плейлист