HDL

It has begun! Details coming soon!

Update: New dungeon finder bosses are active after you stop the invasions.

Update 2: Random dungeon finder bosses are dropping 251 loot, and securing each city opens up two bosses.

http://www.mmo-champion.com/content/2074-Elemental-Invasion-Part-4-We-re-under-attack

The loot is there as well.