I usually don't like to discuss of products that didn't come out yet. However, I found this interesting article http://9to5mac.com/2013/04/08/intel-announces-2014-thunderbolt-with-4k-support-opens-door-for-retina-imacs/ . They are essentially saying that the 2014 Thuderbolt technology will be able to support 4K videos. This could open the possibility of a future Retina iMac 27" release. It doesn't sound so unlikely to me. The iMac price would probably skyrocket, but where is the news? Apple products are generally expensive. My questions are: as designers, how much would a retina display affect the quality of our workflow on a 27" monitor? In a world that is switching to high-density screens, isn't it important that we start designing on high-density displays as well?