Ion chipset. Chief among those is a decreased die size, "much faster graphics," and more than twice the shaders of the original Geforce 9400M /MCP79 chipset that the current Ion is based on (which uses 16 shaders). Not many more details than that, unfortunately, but NVIDIA is supposedly looking to launch Ion 2 by the end of this year -- although not before it sells plenty more Ion 1s, of course.
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