According to the Guardian (UK):
“Microsoft looks ready to kill off Windows RT, its version of Windows devised for chips based on ARMs architecture, judging by remarks by senior executive Julie Larson-Green.Larson-Green, who is executive vice-president of Devices and Studios at Microsoft, said that the aim of Windows RT was “our first go at creating that more closed, turnkey experience [that Apple has on the iPad]…” but that Microsoft now has three mobile operating systems: “We have the Windows Phone OS. We have Windows RT and we have full Windows. Were not going to have three.”
Read rest of article at Microsoft ready to kill Windows RT | Technology | theguardian.com.