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.
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I doubt it is used verbatim as Larian likely made their changes before the D&D One Playtest was released.
It is likely to be inspired by the direction that Wizards of the Coast is taking the Blade Pact.
I think WotC are in some capacity involved with the mechanics of the game and would like the game to reflect some of the changes they are implementing in the next generation of D&D. But the problem there is they are still making changes all the time and some of the changes that WotC wanted to make were catastrophically bad. I can't help but wonder how many of those terrible WotC decisions will plague the game. That is where I believe the horrid new multiclass system comes from for example.
I've participated in all 6 of the D&D One playtests and don't recall any change to multi-classing.
While the new system is certainly different, it might be horrid it might also be good, it's tough for me to say until I've actually tried it.
Although I'll put at least 13s in my multi-classing stats for my first bunch of play-throughs I may experiment with the new system later on. The lack of stat requirements sure makes something like a Storm Sorcerer-Tempest Cleric build much more viable with a 27 point buy.