Hey there all, I know this thread is somewhat old, but I was scrolling through it, and I found some of the theories and explanations to be very engaging and interesting.
Having thought about this same issuer myself quite a bit, as I am a fan of the Mk VI armour, I feel I should bring my own observations to bear.
Essentially, the confirmed firmware/HUD update makes sense and is a valid change for 343i to make. However, from what I can see, the new suit is simply a redesign of the Mk VI, since the scar on the right hand side of the chief’s breast plate is still present, as it was throughout Halo 3, and would have been repaired if the armour was indeed upgraded or replaced by nano bots etc. furthermore, Frank did mention that the new suit has the Braille markings for ‘117’ imprinted on the other side of his chest. A nice, albeit unnecessary touch.
In conclusion, 343i are going to have some serious explaining to do concerning the canon reason for the change, but I feel it is good that they’ve built him the way they want him to look, and respect must be given to the art team for this. But, given that it is still the Mk VI, where did he get the jetpack attachment from!? Did he just suddenly remember he had it?
Anyway, thanks for reading and I am confident that we are all equally looking forward to Halo 4, and best of luck to the 343i team when the game is released.