Netbooks by definition have Intel's Atom in them. You're probably looking along the lines of Ultrabook/Thin-and-light Notebook. And most of Intel's processors that will make it into that form factor that are Ivy Bridge haven't been released yet and are still under embargo. You'll have to wait for Intel to release the rest of the Ivy Bridge lineup.
As for Sandy Bridge:
There are quite a few ultrabooks that are 12" such as the Asus ZenBook/Zenbook Prime UX21 and the MacBook Air 11" (11.6").
For smaller notebooks, there's the Lenovo X130e with Sandy Bridge, or even the X230 is 12.5". Looking around, I saw the HP Pavilion dm1-4170us, which is 11.6".
There's still plenty of smaller laptops around. You just have to look.