Really WoTC won't stop teasing Spelljammer but then don't commit to doing anything with it for 5th Edition.
Nautiloid ships in Volo's Guide to Monsters Illithid section with some space specific gear.
The Morkoth being a helmless Squidship in Storm King's Thunder
The Giff appearing in Mordenkainen's Tome of Foes in the bestiary. Jolly good what what gunpowder and all that such.
The actual crashed Spelljammer, the Stardock, and the Helm in Waterdeep Dungeon of the Mad Mage.
Now in response to the Larian trailer for Baldur's Gate III we have Perkins talking about Nautiloids on a Lore You Should Know and getting into the specificity that Illithids forgot how to make them, how developing the video game changed some conceits and brought in new concepts to their use, and specified that the Illithids are a broken former power in Space...their empire shattered and their ships cast to the wind in small cells/colonies.
I just want to know the status quo of the Known Spheres of Spelljammer as a setting. In the big gap of 3.0-4E as to what happened after the Second Unhuman War and the Vodoni War.