Ubisoft, whatever faults you may throw at them, at least has a very consistent track record of supporting its games for long after release. Games that do well enough seem to receive lots of post-launch support, and Ghost Recon: Wildlands is definitely a game that's been receiving a lot of love from Ubisoft.
The new mode is designed to compliment the Ghost War PvP mode for the third-person shooter. The Extraction mode also comes with all new maps. In the mode, two teams go against each other in 4-vs-4 PvP bouts. One team is focused on locating and escorting a specified target to get them out of the conflict zone. It's almost exactly like Rainbow Six: Siege, where the Rainbow team has to extract the hostage out of a hostile zone, while the terrorist must keep the hostages alive and force the Rainbow team out of the area.
The concept plays out identically in Ghost Recon: Wildlands, where the opposing team must locate the hostages (or keep track of the hostages) and prevent the extraction team from getting to the hostages and extracting them to safety. The hostages must stay alive no matter which side of the conflict you're on, so it literally is a Rainbow Six mode made available in Ghost Recon.
If the opposing team manages to kill off the rescuers while keeping the hostages alive, then the opposing team wins. If the rescuers manage to get the hostages to the extraction zone, then the rescue team wins the round.
The new mode comes with two brand new maps as well, one of which is called "Institute" and the other is called "Garage." The institute is centered around an actual institute area that you can infiltrate, which involves several buildings in a small area. The garage is set just off the road that involves several garage buildings and storage facilities. Both maps can also be played either casually or in ranked mode play, whether you're playing across PC, PS4 or Xbox One.
Not only that, but Ubisoft was generous enough to give gamers all new equipment to acquire as well. In fact, the comparisons to Rainbow Six come into play with the costumes, given that some are literally based on the operators from Rainbow Six: Siege. A few costumes are also based on the campaign characters from Ghost Recon: Wildlands.
There's also a full changelog for the new updates listed over on the Ghost Recon website, where some additional changes have been made to the existing characters in the game and the character classes.
The Ghost War PvP mode originally made its debut back in October of 2017 as a means of extending and expanding the replayability of Ghost Recon: Wildlands, which came out back during the early first half of 2017. You can enjoy the new content via the free update right now.