Let me make this as clear as humanly -blam!- possible.
THE MODELS AND SOUNDS IN THE TRAILER WERE PLACEHOLDERS. THEY USED STUFF FROM REACH SO THEY'D HAVE SOMETHING FOR THE TRAILER, THEY ARE WORKING ON PROPER MODELS FOR THE FINAL GAME. THEY ARE KEEPING THE ORIGINAL SOUNDS*, THEY ARE FIXING MASTER CHIEF'S HELMET FROM WHAT THE TRAILER SHOWED, THEY WILL HAVE MARINE MODELS, THEY ARE MOST LIKELY WORKING ON A PROPER MA5B MODEL (I UNDERSTAND THE CANON, I REALIZE THERE'S ALL THE DIFFERENT VARIANTS OF THE MA5, BUT GODDAMN IF THEY DO END UP KEEPING THE MA37 MODEL IT'S NOT THE END OF THE WORLD), AND AS FOR THE PEOPLE SAYING TO PRESS THE BACK BUTTON TO GO BACK TO THE ORIGINAL GAME, IF I WANTED TO DO THAT I WOULD GET MY DISC FOR THE ORIGINAL GAME AND PUT THAT IN THE CONSOLE IN THE FIRST PLACE, SO IT HAS NO PLACE IN THE ARGUMENT.
Alright, rant over, can we please /thread now?
*They are remaking the soundtrack, using proper instruments instead of being synthesized like the original was.