Heroes of Might & Magic III: Horn of the Abyss

By the way, will the old combined artifacts remain unchanged?

they will remain in their original form - though perhaps the Cloak of the Undead King and the Wings in HotA maps will be banned by default, since they are overpowered, no matter how you look at it.

Yes, you can simply copy them from WoG

well, you could. but is it really necessary... :)