You wont see a dev response to this. For some reason they refuse to pre-announce bonus XP events more than a couple days in advance. We are all expecting it however, as its a pretty much a sure thing.
Wish we would get more than double exp we got last year. Like maybe the 50% off housing and player studio or just any discount in marketplace, like EQ 2 got! How about that crate that had The "Face of the Drowned" illusion Anyone get one? Was supposed to be in those troll crates released last year on Labor day. Although this is post in TLP it is for the whole game but these TLP's do seem to get more action on requests
It is almost certain it will be the same 100% bonus XP it was last year, they have most of these things scripted now.
If the past dozen or so bonuses are any indication we will be officially told about it after it has already begun
They avoid telling us about it ahead of time so people don't schedule time off of work, and then fly into a rage when the servers crash.