Despite still being the best-selling smartphone in the traditionally slow August, the Galaxy S4 sell-through rate has dipped to 5 million units then, which might have prompted Samsung to speed up the development and release of the Galaxy S5...Source: http://www.phonearena.com/news/Samsung-Galaxy-S4-sales-slumped-to-5-million-units-in-August-still-topped-the-ranks_id48345
