Short info to add here. While I'd be happy to be able to play on 31st and content with playing on 3rd, on Steam the Community Update #20 has the updated release date of 3rd of August and additionally still the 72 hours early play for PC mentioned.
So at this point this might as well be a very legal thing. I'm not too sure as I'm not a lawyer and even if I was, I surely wouldn't sue, but it's worth noticing I think.
There is still talk about 72 hour early play for PC users.
Die Collector’s Edition sollte es bis zum 31. August, also dem ursprünglichen Veröffentlichungsdatum, zu euch schaffen. Wenn ihr euch das Spiel für den PC geholt habt, erhaltet ihr euren Steam-Code vorab per E-Mail, sodass ihr früher mit dem Spielen beginnen könnt. (Kurzer Hinweis: Early-Access-Spielstände werden ab dem Zeitpunkt der Veröffentlichung nicht mehr übertragen, dafür aber Spielstände innerhalb des 72-Stunden-Zeitraums vor der Veröffentlichung.)
Deepl Translation:
The Collector's Edition should make it to you by August 31, which is the original release date. If you've purchased the game for PC, you'll receive your Steam code in advance via email so you can start playing sooner. (Quick note: Early Access saves will not be transferred from the time of release, but saves within the 72-hour pre-release period will).
In Polish version it is there as well. But maybe Larian's just did not bother to change this thing from other languages
"Edycja kolekcjonerska powinna pojawić się około 31 sierpnia, czyli w pierwotnej dacie premiery. W przypadku osób, które zamówiły grę na PC, kod Steam zostanie wysłany e-mailem wcześniej, aby można było prędzej rozpocząć zabawę. (Szybka uwaga: zapisy gry z wersji wczesnego dostępu nie zostaną przeniesione do pełnej wersji, ale będzie można przenieść zapisy z wersji finalnej, dostępnej na 72 godziny przed premierą)."
Translation from a filthy polack (me):
"Collector's Edition should arrive around 31st August, which means around the original release date. For people who ordered the game on PC, Steam code will be send via e-mail sooner so you can start your fun quicker.
(Quick note: saves from early access version will not transfer to the full version, but you can transfer saves from final version available 72 hours before the premiere).
So either they forgot to change the other languages or we do get 72 hour early access after all... But who knows at this point. Considering the amount of confusion it could be the former.