TBH, I don't know why we are behind ilvl 75 full set gear. You basically out gear every content post GS 65.
There are no updates regarding the contents after today's raid releases.
The upcoming content should be some event to replace the Summer event that is ending on 2nd Sept.
There was a call for volunteers for testing their new content, so I am assuming the content release will slow down even further.
Speculation - No new content for another month at least and we will have some fall event in the middle.
I guess speculating bullshit is better than having a look at the roadmap that was released before the game release... And also, people speculate from the pet understanding level 90 that it'll be near the 9/23. (remember that XJP was released one week before level 75 parchments were made available)
On another note since you really like talking without doing your researches, in China, XJP normal was released on 2018/09/06 while hard mode was released on 2018/10/11. As you can see, they had harder mode faster than us. However starting on 2018/10/25, one new boss raid was released every week for four weeks.
In our case starting with XJP normal mode, we had two new boss raids every other week. So what can we conclude from that little bit? We're on par with Chinese content release speed, albait in a different order (actually faster depending on XJP hard release date). So I expect them to balance XJP Hard in accordance. But yeah, they're "throttling" content. And every game at release does that. What did you expect? Them to release everything at once, get geared in two weeks and do nothing? Catch up three years of Chinese developement in one year?
Source: gjol wiki