Yeah Frank, feel free to go back to the literal drawing board for halo 5. Bring back the old jackals though. Don't make all the enemies look like small, medium, large and extra large versions of each other. They're all different species united under a common banner. Give them different voices, skin texture, nails etc.
I hope they take Brute animations above what we say with Halo 3. I'd want to fight Chieftains who move like King Kong did in the Peter Jackson remake, very animalistic and unorthodox. Maybe once we shoot off their armor again etc.
Edit: oh and the monks. They have to be back. If I fire up Halo 5 and don't hear them, it's like an instant negative for me. One of the big disappointments with halo 4 launch. Like wtf is this wailing shit.