A report from The Korea Herald suggests that the Galaxy S5 Prime will be produced in limited quantities, due to the high cost of producing the QHD (2560×1440) display on the device. An anonymous source is quoted as saying that the high cost is part of the reason why the standard Galaxy S5 doesn't have a QHD display, and the reason why the Galaxy S5 Prime will follow in the footsteps of the Galaxy Round when it comes to the number of units that will be made available in markets.
The report also says that the Galaxy S5 could undergo an interoperability test as early as this week to test whether “it is ready for the market.” These tests usually take anywhere between one to two months, and if the results are positive, the rumored June launch time frame could turn out to be true, though as with all other rumors surrounding the Galaxy S5 Prime, it's best to take all this with a pinch of salt.
Samsung has been working on a new device codenamed Project KQ, which is expected to be the Galaxy S5 Prime. The device could debut the new octa-core Exynos 5430 processor that sports an integrated Intel LTE modem, clock speeds of up to 2.1 GHz on the powerful Cortex-A15 cores and 1.5GHz on the low-power Cortex-A7 cores, and the Mali T6XXX GPU rated at 600MHz.