Maybe I’m just a killjoy, but the Kylo one doesn’t sound any better to my ear than someone doing a barely passable Adam Driver impression. To the point where I actually thought it was whoever had made the video introducing it first, until I realised it sounded “off” in the way that AI voices can’t quite get the inflections of sentences right.
I would say that it does actually sound just like Adam Driver, just happens that the inflection makes it clear it’s AI. That said, there’s a difference between what Adam Driver sounds like and what Kylo Ren sounds like. But I’m not going to be a killjoy about it at this point, if we do get the chance to make up some new lines, that’d be cool. But ultimately we won’t know if it’ll be usable until we hear it (seems like the AI can be hit and miss).