Larian’s Swen Vincke posted a tweet yesterday showing the game hitting 500,000 concurrent players, making it the third most played game on all of Steam He said that he told IT to only expect 100,000 concurrents at max.
Yes, you can play on a LAN connection, offline assuming you both have your own PCs in the house. There is no split screen multilayer, yet. In fact, this is supposed to be the reason why only the PC version had it's release date moved up. They didn't see it as a requirement for the PC release and decided to work on the PS5 split screen issues, post PC release.
So PS5 will definitely have split screen functionality, and I suppose that might also go to PCs as well, but that's just a guess on my side.
I was just playing split screen multiplayer on PC a couple days ago. Not sure where you heard that PC didn't have it, if that's what you're implying. Seems to be working fine.