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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Eh. It's Halo 4 but even worse. I'm not seeing anything that's better than the final game other than the armor textures and the Repeater. It was nice seeing the Spectre again though.