i dont know if this has been posted already but…
1.Jonesy the cat cameo appearance
2.Gravity rifle.Much like the scarab gun in H2.The original model is already in the source code so 343i can make a cool easter egg from it.Make it hard to reach.
3.fix Zuka 'Zanamee to match description in the book.
4.Engineers.Already in the source code.Give them a non-combat “purpose” like hints to where terminals are.
DonVinzone1 created these ideas on Bnet.