No one really knows but i would assume it would be as good as the speakers in the iPhone 8, Whether the X has the same speakers or perhaps better speakers is something that none of us know at this point,
I care about the quality of the speakers as well as i frequently play music and listen to radio on my iPhone so if the X happens to have better quality speakers i would be thrilled.
I don't recall Apple putting much focus on the speakers of the iPhone X during the keynote so that might mean there wasn't much change in the speaker department in the iPhone X because if there was some noteworthy change and improvement in the speaker department i would assume Apple would have emphasized the change and difference during the Keynote and on the Apple Website.