Hotpot merged directly into placepages -- I see my reviews and reviews from my friends on local pages (it's a really nice experience). I think to get a full picture of a restaurant you might care about:

1) reviews from your friends (hotpot)

2) reviews from food critics (zagat)

3) reviews from the general public (yelp)

So it makes sense to me that hotpot will continue to live where it is (and most likely get turned into a +1 sort of thing so that it can also work with G+)