Ars Technica: Smaller, flexible convertible PC needs either Haswell or a time machine.
Lenovo's IdeaPad Yoga lineup started with two laptops. One, the Yoga 13, is a 13-inch Intel Ultrabook that runs Windows 8. The other, the Yoga 11, is a Tegra 3 laptop running Windows RT.
The problem for Lenovo is that Windows RT hasn't really gone anywhere aside from those devices launched alongside Windows 8 (which included the Yoga and a handful of other convertibles and tablets, most notably Microsoft's own Surface). If you want to know how well the ARM-based convertible did for Lenovo, well, the company no longer sells it directly.
That leaves a hole in the Yoga lineup, and it's a hole that the new Yoga 11S is supposed to fill.