343 Industries, the developers of the second Halo trilogy, have released a large piece of artwork showing off the Master Chief at his finest. There were also some interesting details revealed by the 343 industries team at the Halo Fest: Halo 4 Panel at PAX which also included Frank O'Connor, content creator of the last two Halo games and the creator of Master Chief.
The reclaimer trilogy which the team at 343 has been secretly working on for the last two years will be exploring the Master Chief in depth and what it means to bring him back. They later talked about the planet Cortana and Master Chief are heading towards in the E3 trailer, the mysterious forerunner planet will have a different aspect of forerunner engineering and architecture. The story is a direct continuation after the events of Halo 3 and will deal with the fate of John and Cortana.
Cortana will also be playing an important role in the game and 343 aims to show more of the relationship shared by her with Master Chief. Forge which has been a major part of the series is also something 343 believes in and they're looking to add more tools to that department by giving more power to the players and let the creative juices flow.