The twist in with this mode is the occasional Breach on the landscape: portals that take players into an alternate dimension to battle horrific creatures and mighty Breachlords. It might be a breach to do it, but the rewards are apparently worth the struggle.
Patch 2.5.0 makes a lot of other changes to the game, such as adding 55 new items, improving melee action targeting, and moved the contents of the Essence league into the main game itself.
You know what happens when you encounter a Breach on the beach? Breach beach footprints! Yeah, it’s a real thing, and you can see it after the jump.
Source: Patch notes