There aren't any other ones besides the ones I describe in that post: orange usernames, welcome links for new users, and limiting downvotes. Maybe it would have been more accurate to call them changes rather than features.

the default 1 point you get from commenting no longer adds to your karma. that is, the comment is 'worth' 1 point, but your karma doesn't change. i think it used to...though now im not so sure...

No, 1 is considered the base value. Your karma gets modified based on upvoting/downvoting. (So if you get voted down to a zero, you've lost a karma point.)