I just hope this is true and that we're not getting our hopes up prematurely.
Is there any real reason to believe this is happening? I mean, other than wishful thinking or "it would make sense if..."
What do you mean by "this"? The pact of the blade stuff or the "BG3 will be making lots more changes to look like D&D5.5e" theory?
For the former, the reason is the interview that everyone has been discussing and quoting, which explicitly says that Pact of the Blade will incorporate abilities from the Hexblade patron. Like, sure it might be a complete ChatGPT fabrication. But it's not April Fools and it'd be very ballsy of "mutiplayer.it" to put out a full interview article with the Lead System Designer of Larian 3 weeks before their newest and biggest game's release date.
