Okay, I've read the playtest finally. It appears that they are refactoring the three pacts as cantrips. What is not clear (to me) is whether warlocks will have access to all three of these cantrips. I'm going to guess no, but I really don't know.
In any case, it is also unclear to me whether Larian is actually using this for BG3. The Italian article does not say much, and it appears to be fairly confused about how Warlocks work NOW, so I am not sure how far to trust it (to be fair, the problem may just be Google Translate). My confusion stems from the fact that they say that Warlock does not get an extra attack, but this is untrue due to the fact that blade pact does get access to thirsting blade.
It would be really easy for Larian to just apply charisma mod to attack/damage for blade pact weapons, add the thirsting blade invocation, and then leave everything else pretty much the same as it was in early access. But maybe they did something else? We'll find out on August 3.