No, they don't, but they will. Oho, they will.
In some ways I wish I wasn't working on it so I could see it all and be amazed and in awe of the new dialogue, but in most ways I'm glad I am working on it, because it's super-fun and will make many, many Chrono fans happy.
By the way, I think I've figured out how Lavos will speak to the group. He'll not say anything during the Ocean Palace incident, but when you finally confront him after going through the Black Omen/the bucket/whenever you encounter his shell after that incident, he will act as if humans are foolish creatures who do not understand his power. In essence he will act like an adult scolding children for rebelling against a parent when that kid doesn't understand what is good for him. I do have a somewhat basic framework for his dialogue style. Something like this:
"Why do you wish to fight me? You do not understand my power or my reason for being...I am greater than humanity. You should be happy...within me and my spawn, your DNA will exist forever. Humanity will exist forever. So why do you fight the inevitable?"
That is probably not the best example, but he speaks like that. He never taunts them, not once, nor does he act as if he enjoys killing or anything. He is confused and angry about their actions, though.