From what I know (and seen in Microsoft's explanatory videos), tablets have to meet a certain amount of requirements in order to be allowed to use
Windows 8 RT. Microsoft is working hard on ensuring a smooth experience on all tablets, you can't just slap RT on some half-hearted piece of hardware and think the consumers won't mind (Android anyone?). The touchscreens are bound to a strict criteria list (especially regarding multiple touch inputs), and they will all be good that way. The resolution will of course differ, as will the size and color quality, but the touch experience will be pretty much unified no matter which tablet you buy. Which is REALLY awesome for all consumers.
About it being Tegra 3 successor, Tegra 3 is nothing more than a bog-standard A9 quad core put together by a team that don't know about CPU design. They throw in a 5th core for low power instead of properly gating each real core and having independent voltage planes. Krait eats Tegra for breakfast, and the upcoming A15's will have it for lunch
