Also there could be a new UNSC or Covenant vehicle
UNSC Wolf- four legged mortcycle like vehicle with a closed canopy
Covenant Loper- same concept but with six legs
Don't get me wrong Spartan IIs are raw but Spartan IVs have a) lots of em not just any soldiers but the best of the best marines, ODSTs, etc. c) they still have MJOLNIR armor and also what caboose says is true