Updates
Here is tl;dr of what Anet say yesterday on reddit about all this. Well it is long read but not as bad if have to read entire reddit page with all noise on it.
https://forum-en.gw2archive.eu/forum/game/gw2/GW2-Reddit-Developer-AMA-Summary/
They said every 3 months, there being 3 months per 1/4 a year. With other stuff in between as it becomes ready.
The last big update was in the last week of January, about 5 weeks ago. There are 8 weeks in a 2 month period, and as I said, it’s three months not two between the quarterly updates. So you are a little early on the “are we there yet” questions even for the two months you presume. /grins
From Qugi’s link, a further link, to Dulfy’s excellently readable summary of the AMA:
http://dulfy.net/2016/03/05/gw2-reddit-developer-ama-summary/
The bottom line is they said they want to release polished content, instead of publishing to the clock.