It would be cool if the following things were in halo 4.
1. NO MORE FLOOD! they were lime impossible to kill! and those little spores were SO annoying!
2. Maybe new enimeis like wild animals new alien species, etc.
3. bring back duel wielding
4. forge should include pelicans, phantoms, scarabs, civilian vehicles, hornets, falcons, banshees, heretic banshees,longswords, seraphs ,warthogs, mongoose, all halo 2 weapons and vehicles, shade turrets normal and fuel rod, and everyone known weapons; vehicles; and equipment. (plus dropod
5.If 343 is incharge of halo 4, they have to make a awsome campaign with a good storline.
6. halo reach type armory, but there will be levels to achieve instead of the credit system. also, players should have the choise to be a grunt, brute, elite, hunter, drone, jackal, skirmesher, marine or odst including diffrent armor customizations for all of them each. plus each speicies should have there own special ability to even out there diffences.
7. matchmaking should have all Reach's gametypes plus the following: dogfights, (get longswords and duel each other in head to head aeirial combat) Spacebattle ( a gametype sort of like invasion except there is a human ship and then a covenant ship and the covenant side gets seraphs and the humans get sabers, and each team has to blow up each others ships) and Underground ( a gametype were players go in a drill to find a diamond or something and try to get it to there base on the surface.)
8. MAKE THIS TEH BEST GAME EV4R!!!!! good luck 343!