Preview of Water Tech Improvements

One question for delve league (well more in general, but still): Is there new stuff for hideouts coming? And I'm not talking about microtransactions and/or stuff from boxes. I mean actual new stuff from masters or changes to hideouts in general, be it decorations, the possibility to save layouts, customisable lighting or music, more layouts or full on three dimensional customisation with stairs and such, anything. Chris had mentioned that "something awesome" is being worked on... but that was before fall of oriath hit. He then later said that the team hadn't found the right timing to fit it into an expansion. However, hideout improvements would fit nicely into everything endgame related, so war for the atlas would've been a good choice for that imho.
So again, is what he was refering to still in the works? And if so, when can we expect it to hit live? Can we get more information about that?
I know the part of the community that actually cares for their hideout as a piece of art is... not the majority, to put it friendly. Still, hideouts are an important part of the game and honestly one of the things that have A LOT of potential imo.

As for delve league related stuff, how much voltaxic sulphite does one need to delve, do you get enough from one zone to make a delve that lasts about as long as a map would? Do you encounter it in every zone or is RNG based? Is it always the same amount?
Also, how does delve tie in with the lore, does it build on any other league? Does the mine reach deep enough to hit the abyssal depths themselves? And how is voltaxic sulphite related to voltaxic rift?