SoW2 will feature not one, but three types of bosses.

Standard Bosses: not standard as in Aquamentus & Gleeok kinda standard. Many boss will be mildly custom using the enemy editor. Standard bosses means that they appear at te end of a level, just like most Zelda games.

Big Bosses: Because this game adapts the Zelda 2 universe, the six palaces and their guardians make an appearance. But the palaces will no be the standard level. They will often come after beating a level, or before a new level. They are the 6 main bosses in Zelda 2 redone.

Story Bosses: They are pretty much random encounter bosses, probably the toughest of them all because many of these encounters forces you to evade the enemy that is more powerful than you are. Two examples being Rash and The Undead Deity.