: Campaign
: -----------
: Campaign only preferred.

Yes!

: All graphical assets to be remade and even re-envisioned.

Er...

: All movement and physics replaced with Halo 4 engine assets.

No. Please, no.
Halo 4's movement was lethargic, grenade range was too short, and... a lot of other things that really shouldn't overwrite classic Halo.

: Campaign story to remain 90% accurate of the original game. New ending
: allowed for clarity.

Extended Edition? Extra closure included?

: Covenant races shall not speak Human dialects except in rare situations.
: Subtitled where required.

That's... that's the big reason why the Covenant were unfun to fight in Halo 4. If you can't understand them, if they have no personality to play off each other, then they're just another generic alien race.

And don't you dare write it off as 'realism'. The Chief can store the UNSC's most advanced AI in his helmet, why not a translator program?

: Little to no clowning by Grunts. This story is serious.

*Heartbreaks*