…if you have one, that is.
It’s a nice new update, which should hopefully reduce the number of spammy reviews, and fake comments from anon users. Apart from that, it’s also hitting two birds with one stone – pump up the number of Google+ users. Of course, that is another thing, but yeah.
I haven’t seen any such notification yet, even when I’ve logged in and out of Play store web a couple oftimes, but Artem from Android Police did, and here’s how Google will notify you about it.
Currently, only reviews from the web Play store link to your Google+ profile, not those from the phones. It’s possible it might come in an update, though.