The rumor site heard the shrunk version of ION will have a faster graphics core with more than double as much shaders than the original GeForce 9400M chip.
Since ION has 16 shaders , or processors as Nvidia calls them these days, you should expect that the new one has more than 32. This will get much better gaming to netbooks and nettops based on ION 2 which is definitely something you cannot say no to and at the same time Cuda applications might run faster, in case you found one that matter to you.