Kobo has also added a new review section to its website. I haven't seen the reviews anywhere, but my competitor reports that Kobo is now drawing reviews from iDreambooks, the book review aggregator. This is the same company which Sony signed with last year when Sony was still trying to build its ebook business.
The reviews reportedly appear towards the bottom of a listing, below the recommended titles. I can't see them, so I'll just have to take everyone's word for that.
I can't see that section either, but I do know that Kobo started adding user reviews in May 2014. That was when they launched a new page which let anyone with a Facebook account give a star rating and write a review. This is the first I have heard that the reviews had gone live.
The Kobo website has been absent reviews since July 2013, when it cut ties with Goodreads (which had been bought by Amazon only a few months before).