Campaign
1) Predict the story line of the Campaign.
Something like a Halo 1-3 Storyline.
2) Predict the enemy, or enemies that you will encounter.
Forerunners.
3) Predict the human and/or non human friendlies, if any, you think will either fight along side the Master Chief.
Maybe Arbiter will be there, helping out Chief (2nd player in Campaign like Halo 3 had)
4) Predict Cortana's type of break down and whether or not she survives.
She will survive but will have lots of problems throughout the Campaign, maybe she meets Dr. Hashley and gets fixed?
5) Predict the outcome of the Halo 4 Campaign.
It will be very gorgeous and fun to play for the Classic Gamers that have played Halo 1-3, and have a wonderful ending with a outstanding plot.
Match Making
1) Predict the weapons that will be available.
Halo 3 Weapons, some Reach weapons and some new Forerunner weapons...
2) Predict the Armors that will be available.
A mix from Halo 3 and Reach armors, the Halo 3 Helmet Designs like Hayabusa and lots of Choices Reach had.
3) Predict the ranking system that will be used.
1-50 Ranking system FTW! Credits maybe for BUYING the armor after unlocking it.
4) Predict types of maps that we will fight on (Example: Urban, Jungle, Forest, Water, Space) and offer a brief description of each.
Some Halo 1 maps and new Forerunner maps that are not rip offs from the Campaign.
5) Predict the style of Firefight, if it continues, that will be available.
Floodfight, waves of Flood coming round after round trying to demolish you while you fight them off waiting for evac
6) Predict the Forge environments (base maps), forge materials (structures, objects, environmental elements) and what game types will be able to be forge.
I think new Forge pieces will come, more environmental and natural feeling, with some Forerunner items like Reach had, Weather effects and a more bigger budget than what Reach had. Gametypes: Infection, Invasion, Halo 3 Gametypes, etc. The usual gametypes and maybe some more that 343 will come up with.