Here's a 39 minute video of Gamecheat messing around with the Pre-Release version of Halo 4. You'll see some things new, and some that aren't even in yet. I found this interesting because of the Spartan pose, music, and bleeps and bloops you'll hear in the background on the menu. Those of which I actually prefer more than what we have now.
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The only thing that really makes this more nostalgic than the actual game is how the music has such an emotional weight to it where as the final version sounded like one of those shoddy multiplayer pump up tracks.