If you're following discussions on a post that is getting 100s of comments, going back and figuring out which ones are new since the last time you checked is really cumbersome. Is there a way to show only new comments?
Short answer: No.<p>Longer answer: No, and it won't happen soon.<p>Even longer answer: There may be a Chrome extension of GreaseMonkey script to do something like this, but I've not found one.