Not sure if you already found the answer elsewhere, but this there's basically no read tracking yet.
The color change is just the usual browser "visited" feature (and on most browsers it won't change till the page is in your browser history), the old site didn't have different colors for it at all, this one's more or less like the cnn typography.
In any case, real read tracking is yet to be solved.
Edit: orange underline just means post date > your last login date.
The old site would combine that with read tracking (only within your session and imperfect) to remove the orange icon and add it back.
We held off in case we decide to do it perfectly instead of the old way's shortcut. Though I have to admit the old way's ease on the coders is appealing right now.