• New spells : Detonate, Plague, and Dominate Mind
• New Undead unit : Observer
• New Hero units : Archer, Angel
• New map : Southlands
• A minimap has been added
• Projectile graphics for each unit have been added
• Fog / Cloud Shadows for each map have been added
• Units now bleed different colored blood (very important for lore and balance reasons)
• Upgrade levels for each spell
• Upgrade levels for Skeleton and Zombie added
• Mana costs for spells are now visible
• Plus lots of tweaks and balance changes

I can't remember the rest of the changes ¯\_(ツ)_/¯