How are you defining "netbook?" The original definition is basically something really small, really cheap and really slow. 😛 If Ivy Bridge is inside it, then it can't be really cheap or really slow.
If you're willing to pay more, you can get (or will be able to get) netbook-sized units with Ivy Bridge in it at prices higher than traditional netbooks.
For instance, I have a Samsung Series 3 notebook that many would consider a netbook. It has a ULV Core i3 Sandy Bridge with HD 3000 graphics, an 11.6" screen and weighs 2.9 pounds. However, it also has an MSRP of $700.