Hopefully you will get an official reply here, but here are 2 cents from a fellow community member:
Will there be Cross Buy?
Meaning, will I need to purchase a PC version and a PS5 version or do I only one version to play on both platforms? (usually via a game key/code or something)
Nothing of that sort was announced, and Larian's website is selling platform specific Baldur's Gate3 copies, so I assume you would need to buy two copies of BG3 (PC and console). I am not aware of a game that would offer Cross Buy - Sony/Steam/GOG (and possibly Microsoft) will all want their cut.
Will Early Access ever come to PS5?
Or will it only ever be desktops only?
Early Access is finished (you can still play it on PC, but there will be no more updates) and PS5 copy currently on sale doesn't seem to include Early Access, so no.
Other than the Community Update #18, are there any other gameplay console videos?
It appears the Release Date Reveal Trailer posted to #18 was taken on console. Are there any other console videos, especially relating to buttons/controllers etc.?
That trailer so far has been the only sneak peak we had at the controller UI and the console port. It's been a reveal that there will be a console port to begin with, so I would stay tuned for more footage to be most likely shown later down the line.
