The iPhone 5s updated with A8 processor?

According to the Japanese blog, which sometimes has good news, Apple is preparing an "iPhone 5s Mark II" (we do not know if it's a name used internally or just a nickname given by the blog). This new edition would include a A8 processor, Wi-Fi 802.11ac, Bluetooth 4.1 and a better camera. For the record, the iPhone 5S A7 is equipped with a chip, Wi-Fi 802.11n and Bluetooth 4.0. The iPhone 5s Mark II is already in production and can leave at any time, says the site. This rumor puzzling. In the past, Apple has introduced a more finely engraved processor into products being marketed (the A5 Apple TV and iPad 2), but without changing processor generation. IPhone 5s boosted marketer would be less easy than the iPhone 6c announced by the rumor. Unless either as a transitional device ... iPhone 5s is currently sold from € 509.