I'm curious as to the answer to Roger's question as well. (In both senses of the word "succeeding"--are these Starbuckses succeeding as wine bars in the eyes of customers, and is the experiment proving to be financially successful for the company.)
I went to the Diversey/Sheffield one for an "open house" type thing for the neighbors when they first opened. We enjoyed the wine pours, and the hors d'oeuvre were tasty. I've been back many a time since, but during the day, and for coffee and usual Starbucks fare, so I can't report on the new items on a typical evening.
I do hope they succeed, though, because as part of the revamp, they did a nice remodel/redecoration of the interior and of the patio, which makes me hope the investment pays out.
I can tell you that if you're looking for a Starbucks with this concept, look for ones where the awnings and mermaid sign are black, not green. That seems to be the signifier.