Feldon 
From EverQuest2.com:
The Gear Up, Level Up weekly bonuses continue in Norrath!
From 12:00PM PT (Noon) on Friday, October 21, 2016 to 12:00PM PT (Noon) on Friday, October 28, 2016, ALL Players will get Double Loot AND Double Personal and Guild Status.
Keep on grinding, Norrathians – Kunark Ascending is on its way!
Are we going to get a double XP week before the xpac too?
Yes, promo 4 & 6 will have double XP.
“ALL Players will get Double Loot”
What does this mean because I didn’t see double loot in contested chests or heroic chests… I wish they would define what “Loot” is
There is a chance of the chests dropping double loot. There’s also a chance some zones will drop more chests. What those chances are I don’t know and how those chances differ between heroic and raid zones I also have no idea.
I can say that my guild raided all TOT zones last week and we saw this happen on occasion, it wasn’t rare but it wasn’t exactly common either. That’s all anecdotal of course.
I believe I read it’s supposed to be 25% chance for double loot on final bosses. Looking for the correct dev post now…
Here it is from everquest2.com:
I think most people have (reasonably) assumed they should be getting double loot across the board, since this is the only place I’ve seen the actual parameters spelled out. The double loot I’ve seen personally falls right in line with this quote.
Oh great. So I get even more infusers.
Better be more actual loot on the loot tables next xpac…