So, JK Shin hasn't emerged from Samsung's HQ declaring that his company has sold 20 million Galaxy S 4s, but the day (and week) is still young. Korea's news media is quoting the CEO as saying that Samsung's flagship Jay-Z player / handset has seen its sales double from the 10 million that was announced at the tail-end of May. Given that we're but a few days away from the company's next earnings estimates, we'll probably find out for certain soon enough.