Yes it's the first update of a new decade. It's not super revolutionary but we will need to DOWN all the servers briefly.
This will occur at approximately 8PM Pacific time (11PM EST)
Main things in this update are:
Elemental planes will now have bosses. These are intended to be soloable/low mannable and drop 2 Guaranteed Ultrarare items as well as an UR weapon and identified gems matching the elemental. Additionally, earning tags from the elemental bosses will grant your character 1% elemental immunity, matching the elemental, per each boss tag.
Each element has 2 bosses each - one good one evil - Making a total of 8 bosses!
They are spawned by placing gems (ecrystallized elementals) dropped by Primal elementals of the opposite type on an altar found in the deep area of the element.
EX - Air Elemental bosses can be spawned by placing an encapsulated earth elemental on the air altar. Which boss spawns is random but only one boss spawns per reset.