As far as I know, there are a few manufacturers that have their KT880 boards listed on their sites (Abit, Asus, and Soltek are the ones that come to mind.) However, there arent any actual production boards that are yet available on the US market, so I dont think there will be any actual reviews until boards actually begin to hit the retail markets
You might want to try looking on Japanese or other Asian hardware sites and see if they have any reviews. The Asian market tends to get products before the US market, so the KT880 might already be out over there and reviewed.