ASUS have already pledged to Microsoft's Windows RT, but they've just been joined by Samsung, Dell and Lenovo. HP is still MIA when it comes to Windows RT-based devices. When Microsoft announced their Surface tablets, HP said they've start out by building Intel-based business notebooks only. They'd wait for input from their customers for the move to Windows RT.
HP feels that the already established x86 platform provides the best customer experience right now, and in the immediate future. Microsoft does fan the flames out that we won't be seeing only ARM-based tablets from these manufacturers, with some of them making full-sized notebooks, too.
Early buzz on battery estimates is also here from Windows RT-based devices where we should see systems with 10.1- to 11.6-inch displays and 25 to 42 Whr batteries have said to provide between eight and 13 hours of runtime. Tests were used running full-screen HD video while the device was sycned to a single e-mail account.
Performance-wise, Windows RT devices should be capable of pushing 60fps during OS animations and touchpad gestures are now supported natively in the firmware.