You might also consider merely greying out comments that
have not yet been endorsed, as currently happens to down-
voted comments.
I agree with this, except that pending comments should probably be visually differentiated from downvoted ones (maybe a shade of green like new usernames). Otherwise, you risk subtly prejudicing a reader that has grown accustomed to the original meaning of the greying-out.Either way, I'd advocate for a "showpending" toggle for users with under 1000 karma.