The map "30 times bigger" than the normal arena, is called Talon island, and it's divided into several zones like the town of Anvilfall, the Glimmering Woods, the Starlight Oasis, and the Ancient Tomb.
Talon Island is located in the Great River Valley of Daharin, which is also the home of Ulric "The Unwavering Light" and where the headquarters of his order is located, the Monastery of Resonance.
As you can see, the lore of Battlerite is expanding little by little, and the developers have begun to work with the talented lore writer Christopher Harrow to improve their universe building. And when it comes for the design of the island -or so it's explained- they have chosen to breathe some colorful, varied and engaging looks into it, as to invite players to explore the island rather than focusing on combat only.
I've got to say, I'm excited to see how the map will turn out in the end when it releases on Steam. They are putting much work into it and I feel like the mode may become something more interesting than just another Battle Royale. But we shall see.
Finally, for more concept arts and details, please visit their official blog.