We also have a 10-boss raid at launch, called Castle Nathria. This was a super fun project for our dungeon team and our encounter designers, like, we asked them, "build Dracula's castle, make it a raid". Kinda writes itself, it's gonna be pretty awesome.
Here's an early layout as we're starting to figure out how it's gonna flow, you're coming from the main door of the Castle, for once not coming from the sewer. It's a winged raid, so you have the choice of descending into the catacombs or exploring the royal quarters, each of which have 3 more bosses. Once you've cleared both those wings, the upper reaches of the castle will become available, as you ascend the upper spire to face the lord of the castle himself.