I'll agree that I find it a bit confusing, but the current
Collector's Edition website says "All of the Digital Deluxe Edition DLC content is also included with the Collector’s Edition, which gives you 72 hours Early Access, a unique dice skin, a collection of Divinity-inspired items, and the Adventurer’s Pouch, along with the digital downloadable OST, Artbook and Character Sheets. In addition, Collector’s Edition owners will receive an exclusive in-game skin based on the physical Metal D20.".
Salo also confirmed
here that the free Digital Edition upgrade would be applied for Early Access players on 28 August.
Interestingly, there's no mention on the latest CE website of the the 72 early access being just for act 1, which I'll admit always seemed something that it would be unnecessarily tricky to implement. I have my fingers crossed that we'll simply get access to the full game 72 hours early even though I doubt I'll get through all of act 1 in three days anyway! Though I see that the PS5 store Digital Deluxe Edition info does still mention act 1 early access. I can't find any info about the PC/Mac version of the Digital Deluxe edition specifically on the Larian website beyond that bit on the CE page, and the GOG and Steam pages still just have the Early Access links, where obviously you can't buy the Digital Deluxe version separately as everyone who buys the Early Access version gets a free upgrade anyway!
Perhaps we'll get a definitive steer at the next PFH in July.