The Secret World ramped up its endgame content challenge by including new Nightmare Mode dungeon. And now Funcom is ratcheting back the other way to make things better for casual players in 1.2. Some of the changes will include lair groups for 5 players, additional Anima Wells in some lairs that were deemed to be too far apart, a new item mission for each lair, loot changes for playfield and regional bosses and more.
Nightmare dungeons will remain untouched and still be the quickest and more difficult path to acquiring more gear.
Source: Lairs in The Secret World