The Tegra 4 variant in Shield has ~ 2x better CPU performance and ~ 1.7x better GPU performance compared to the S600 variant in the new [2013] Nexus 7.
Yes 2 times CPU seems excesive: http://browser.primatelabs.com/geekbench2/compare/2242949/2238898
On an aside, Kepler.M is already sampling to customers, which is a relief given how late T4 started sampling.
I know that Tegra 4 has about 1.5 to 1.6 times higher graphics performance than the Adreno 320 in the Nexus 7 (I compared the Shield to the Nexus 7), but could you provide some numbers to back up those CPU performance claims? 2× seems awfully high.
If Kepler.M is already sampling, could we see it in Surface 2?
If Surface 2 [RT] launches this year, then there is no way that Kepler.M will be inside. Kepler.M only recently started sampling, so products using Kepler.M will not reach the market until Q1 2014 at the earliest I would think.
For what it's worth, I don't think there will be any new Windows RT devices available this year with Tegra inside. Asus, Acer, Lenovo, Dell, etc. are not supporting that platform (at least for the short-term). Microsoft needs to figure out a way to foster the ARM ecosystem (perhaps by merging their Windows Phone and Tablet operating systems for ARM-powered devices and creating a very efficient and inexpensive operating system for these devices), as they are in the awkward position of having most of their Windows Phones powered by ARM processors but with a complete lack of synergy between ARM and x86 with competing OS's in their Windows Tablets.
Microsoft has already officially stated that their will updated versions of the Surface RT and Pro in in Q4 2013 and Jen Hsun also announced 2 days ago that NVIDIA is working hard on the next Surface RT tablet.
They may have been working hard on the next Surface RT tablet, but based on the most recent Q&A session, I get the sense that they did not win that design win (although I could be wrong about that).
That could fit with the idea of nVidia doing their own WinRT tablet, especially if they were basically pushing a reference design to an OEM for this in the first place.
Unfortunately, non-Microsoft WinRT tablets are in a bad position since they can't compete with SurfaceRT prices, not unless MS starts giving better deals. It's no wonder Acer, Asus, etc don't want it.