Couple things I noticed:
-The motion tracker now has vehicle-specific symbols on it, showing direction and occupied or not.
-Scorpion's reticle shows drop-off range... now maybe people will have to show some accuracy for long-range Scorpion shots...?
-The Ghost (and I assume other Covenant vehicles) now have a boost bar in the upper left area.
-It's not all Wolves and Unicorns; new team emblems which include a Shark's jaws and what appears to be a Shark's fin moving through water.