The Galaxy S IV probably will not make its appearance so soon but there are already rumors floating around the device on the Internet. Given its impending popularity, the appearance of an unofficial mockup video of the S IV doesn't quite strike us as that surprising. Do note that the video is purely speculative in nature.
According to Rozetked, here’s what the Galaxy S IV (GT-I9500) will come with:
The device has also been described to be “the... thinnest one, much thinner than Galaxy S3 & iPhone 5” and will come with a “projection laser keyboard dock included”. The latter is most likely untrue but it doesn't hurt for us to hope. Either way, news of Samsung allegedly showing off a 4.99-inch SUPER AMOLED display with 1080p resolution and 440ppi at CES 2013 might correspond to the upcoming S IV, so that's one speculation closer to the truth.