ComiXology is usually keeping up with the latest-and-greatest, and it's doing so yet again by rapidly updating its Comics app to meet the new iPad's Retina-sized needs. In addition to the CMX-HD comic books coming to the 2048 x 1536 screen, the updated application also includes novel social sharing features via Twitter, Zuck's network and email. Among other bits worth noting are a handful of nondescript bug fixes as well as stability improvements. Best of all, the refresh won't cost you a dime and
