CAMPAIGN- I think it would be cool in Halo 5 if you had six sides (UNSC, the Covenant, the Elites, the Forerunners, the flood, and the Brutes). Lets go over each side real quick:
UNSC- The same as in Halo 4 but I think it would be cool to have ODSTs, space marines (like in Reach), and Spartan IIIs.
the Covenant- The covenant didn't have as much species in halo 4 as the other games and it should have more in Halo 5, such as skirmishers and drones.
the Elites- When I say elites I mean the "good" elites, lead by the arbiter. I think just about everyone liked the elites being on your side in Halo 3 but it wouldn't be the same if the elites were permenantly gone from the Covenant, so make them on both sides. for and against you. One thing I don't think would be good is if the good elites barely had any armor i would recomend them just having the Halo 3 armor.
the Forerunners- The Forerunners are pretty set but there's just a couple of things I would recomend and that is bringing back the sentinals and making vehicles.
the Flood- the flood is also well set off and other than them being in the game I don't think anything should change.
the Brutes- It would be awsome if the brutes were back and led by a new san-shyum, and maybe in an alliance with the species not in the covenant (excluding humans,the good elites, forerunners, and the flood).
FIREFIGHT AND SPARTAN OPS- Honestly I like both about the same and would rather firefight be in Halo 5, but it wouldn't be the worst thing for them to exclude. Since there would be six sides I think you should be able to decide on firefight options which side to fight the Covenant, forerunners, the flood, or the brutes. Or you could just combine the enemies and fight a couple sides or all sides.
Here are some other things I would love to see in Halo 5:
ODST firefight and ops.
Spartan firefight and ops.
Elite firefight and ops.
Also I think it would be awsome to make it were you can be on the enemy team like in Reach but have it were you could be covenant and brute.
MATCHMAKING- something that should be included in mathmaking is invasion; and diferant invasion gametypes alow the bad team to be their covenant character or their brute character. 343 should also make an ODST gametype were it's two teams of ODSTs going against eachother, and more of a call of duty style of playing. The last thing I think is important is to make it were you can choose your species (elite or spartan).
SPECIALIZATIONS- I think that each specialization should have it's own abilaty, for example: operator- increased damage, wetwork- increased acuracy, tracker- increased speed, etc. One thing that would be really cool is if one specialization alowed you to be a spartan III and have active camo that would not run out unless they are shot, move too quickly, or press the button to get out of active camo or if that is too unfair make the camo run like three times longer than the origianal.
FORGE- There are just a few things I would like to see changed in forge:
Make an unlimited amount of objects to place.
Allow players to spawn enimies (and choose it's weapon).
Keep the tree spawning, it makes forge better.
Spawn pelicans and phantoms.
OTHER:
Allow dual wielding.
Bring back the silenced smg and pistol.
Make the good elites have plasma rifles instead of storm rifles.
Make the brutes have the halo 3 armor, and go berserk.
Have all the brute weapons from halo 3.
Have either the hornet or falcon, or both.
Bring back the scarab.
