Dismounted elements lose horse holders if they make a tactical move. Everyone is impetuous if within looting distance of baggage. Psiloi can now be killed by bow fire if doubled. You can also turn in a one-element wide gap. Terrain setup is completely different and crossing rivers has changed.
Elephants can support other elephants as overlaps.
Positions of commands at deployment must now be recorded from right to left and front to rear. Back rank elements can cross front of enemy if their front rank can. If moving into contact elements can move up to half an elements width to line up for no extra movement cost. Irreg Spear are no longer spontaneous. Spontaneous troops that can shoot stop 50p from mounted enemy.