The guild-focused update of Operation Nightmare is now live, which introduces new challenges for "well geared guilds," as they add better guild bonuses and a new crafting options. There are game tweaks too - honest.
Nightmare Mode also unlocks for Operation: Terror From Beyond, granting access to the "most challenging Operations bosses" and a new sub-tier gear which is spread across them as loot.
In fact to complete the new Kell Dragon sub-tier, you'll need to wait for Update 2.2.2 as Nightmare Mode is then added to Operation: Scum and Villainy.
Depending on the number of active guild members, the current 5% XP bonus could raise to 10%. They've also included a scalable 10% bonus to reputation gains with factions. Crafters get some good news too as Kell Dragon is the new "best-in-slot gear for PvE," while Underworld gear is now able to be reverse engineered into schematics.
A full run down of Update 2.2: Operation Nightmare is available on the.