Arel Wars 2 is the sequel to Gamevil's original entry into the head-to-head castle defense genre. From the trailer we can see that the game contains their usual high visual and audio presentation, along with lots of upgrading, different units, and a continuation of the kingdom of Drusilla.
It looks like a lot of fun. Gamevil's games can be pretty grind heavy though so we'll have to see if their upgrading mechanics have decent progression, or failing that, that the battle system is fun enough to hold our interest.
No release date has been confirmed, but it should be out before the end of August.