We're pretty excited about this one.
Enable "Threaded Comments Beta"
Check something that has comments.
1) If you like classic mode, select "Sort by Time" and you'll get nesting as well as Chronological comments
2) Only one layer of nesting (replying to another comment) is currently enabled. We can go to a max of 4 layers deep if this is deemed needed
3) GUI is disabled by default, but you can enable it if you want to get all memey on a comment section
4) Low voted comments are hidden by default, but at the bottom of the comment box you can disable this so you can bathe in the hate if that floats your boat
Its a pretty slick update. Somewhere between the old system and what we have in the forums. I'm really excited.
Try it out and post feedback here!