We'll probably get one more PS4 Pro with an SSD and a 4k BR drive before the jump to PS5. Unless they want to use that hardware in said PS5 to bolster their performance numbers to differentiate it from a PS4, I guess.
No PC demo until after launch because the dev is afraid that the demo will get ripped apart and datamined. BioWare did the same thing with Andromeda's MP demo.
Though that got shelved for consoles too, eventually.
WB said they're not going to be patching it any more, and any problems that currently exist (as of... a year ago I think?) are there forever.
Console version is fine though.