I like Squad mode from Call of Duty Ghosts so much , here are some of my suggestions
Make it able to invite friend to play Squad V Squad mode.
Make DLC maps available to use in squad mode eg. Wargame.
Able to choose map and mode in Wargame
add Spectator mode watch your squad vs another squad
Earn some SP from squad report
A.I. Squad able to earn xp for themself from each match they played
Able to give your squad order like ask them to escort or go for all out attack or regroup (this last one could add in this game or next game in series)