The remake in Descent is Empire. Unlike traditional remakes, this is more like a re-imagining. Treyarch does a good job of bringing something that is familiar into a new game with a new movement system.
The video below shows you a walkthrough of Empire that allows you to see the map in all detail. This is the video you need to watch if you want to see what you need to know to dominate.
Empire is Raid from Black Ops 2, in a new location with wallrunning and an even faster pace style of play. The video above walks through the map showing off sections that look familiar, but also fresh.
Activision teases, "The fan favorite Call of Duty: Black Ops II map, Raid, gets a fresh upgrade enhanced by the Black Ops III chained movement system. The classic medium-sized map features an authentic Roman villa recreated by a modern-day eccentric billionaire and mixed site lines enable any style of gameplay."
David Vonderhaar, Studio Design Director at Treyarch shares that Raid will play faster because there is a no auto-mantle penalty in Call of Duty: Black Ops 3.
Watch the Empire gameplay above to see how the new map plays on Hardpoint. This video shows off a competitive gameplay experience in a quick four minute edited down game.