The correct answer is "no one knows yet, only that it's different to PnP".
I will mention that a hexblade pact of the blade gets two weapons they can use charisma with, one that they summon and one that they bind to.
Which is exactly what Jeremy Crawford said in the post I linked to.
And isn't really relevant to the original question. It's just a curious wrinkle.
When it comes to coding the ability it's easiest just to have CHA apply to everything. Seems to be how they have done monks with DEX. It's the "summon a weapon" bit that's irritating to code. You go have a big long menu of potential weapons? Open a store interface?
