Yes, and it could be as simple as a blue dot, on posts you "follow" that have new comments. Hivemind will keep track of the last time you viewed that post and if new comments have been made, and then serve this info to the front-end.
This also means that whenever you view a post that you "follow", a custom_json op will need to be broadcast to the blockchain recording what time you did, and that has implications worth thinking about as well.
The highlighting part, automatic scrolling, etc, are up to the front-end devs to get creative with and implement.