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Zooming in liveview and playback is done differently, you now use the magnifying glass button and then the front control dial. I don't like this much, nor do I like the Rating button or the other one with a pen on, I will never ever use them.
I actually found a good use for the rating button somewhat by accident.
Sometimes when doing portraits of friends and family, I will ask them to quickly go through the pictures and flag the ones where they like their own look. Young women seem to partcularly appreciate this as they can be very particular about the expressions they feel comfortable showing. Me, I do not always pick up on this myself, so I like getting some direction
Since the rating is automatically imported into Lightroom, I can concentrate on the cross-section of the photos I would choose (technically good, etc) and the photos the subject chose. Since the screen on camera is relatively small, it also automatically hides smaller imperfections that I might fix in post anyway, so that is ususally not an issue.
Of course, this might not work for all subjects or situations (paying high-end clients come to mind), but it has helped me a lot on a couple of occasions.
Also, I believe that it is possible to re-configure the rating and "pen" button for other functions, so it's not like they're useless.