This "speed meta" is also why Path of Exile's last league, Bestiary, wasn't received too warmly. It's Pokemon-inspired catch 'em all design was satisfyingly deep but necessitated constant pauses from the wanton slaughter, which isn't that much fun in a game that is all about wanton slaughter. But the new expansion, which launches on June 1, is a combination of both. It has the speed of Breach with a deep strategic layer evocative of Bestiary. Oh, and you also can screw with the time continuum POE currency trade .
 

Back to the Future
Incursion focuses entirely on an ancient Vaal treasure temple called Atzoatl that was lost after the Vaal Cataclysm. "The central core of Incursion is that actions you make in the past can affect the present day," Chris Wilson, lead designer at developer Grinding Gear Games tells me. No one knows where to find it, but a new character called Alva Valai has a hypothesis on how to uncover its location. As players enter each new area during a regular campaign, they'll encounter Alva standing next to some Vaal marker stones. If you talk to her, she'll offer to use these stones to send you to the temple as it existed in the past. In doing so, you'll gradually reveal the location of the temple as it exists in the present.

These incursions send you into a random room within Atzoatl in the past where you'll only have a limited amount of time to kill all the monsters found there. Each kill grants you more time, but you're still going to need to move as fast as you can. Because this section is so time-intensive, there's no need to worry about picking up items or managing your inventory. A bar on the bottom of the screen tracks your progress toward killing every monster in the area and, once the timer runs out and you're sent back to the present, all the items you would have accumulated spill out in one glorious fountain of loot.

Note the meter near the bottom indicating how much loot you've acquired. 
Over the course of the campaign and subsequent endgame, you'll perform incursions, shape the temple, and run the present-day version countless times.

Wilson tells me that this is the first layer of Incursion: Here's a room full of monsters to kill and a fountain of loot to enjoy for doing so. On the surface, it's something that barely breaks the flow of the regular campaign buy POE currency .