Some of the assets what have been shown about Elysium is available in the normal 3D format like the arch, the bridge with horse statues and several types of building also the castle too in developer tools.
They've been in the gamefiles for a while but I think they only did that for the custom maps, so people would attempt to make Elysium so they don't have to
Im gonna put it plain and simple (ish) If you load into the game and load up the map screen and zoom all the way out. It looks tiny and stupid. There is a lot of room to be used and even with that being said without looking at the map just seeing everything outside of the playable area there is ALOTTTTT of space that could be utilised heavily. They flopped hard but we have 4 years left of content to come so hopefully a lot of map will be added.
I REALLY want elysium back they had it finished so why can't they just put it in? They clearly listen to the fans so maybe there's hope but they even had a npc that talked about elysium being "blocked" and wouldn't open for "several months" soooooo 🤷♂️ like cmon techland
Got it almost a year ago by doing a challenge and leaving half way through it, it's patched now but there are other ways to get it but idk them cause I already got it