FUD Zilla writes NVIDIA's upcoming ION2 will have little more to offer than the current ION platform + Optimus support. Originally, the chip was supposed to have 40 shaders, but this plan got cancelled and now NVIDIA intends to launch two ION2 chips. One version will have fewer shaders than the current ION, while the faster one should have a lot more and end up slightly faster than the current platform.
Since Nvidia came to some sort of silent ceasefire with Intel, this chip with 40 Shaders will never make it to ION 2. The product was codenamed MCP89 and it might show up on some Intel-based chipset a with high possibility of launch at Cebit next week.
The new ION for N450 and 470 chips won't be as fast and it won't be chipset to begin with. It will be a discrete chip branded as ION. Compared to the current ION will boost battery life (at least in theory) with the help of Optimus technology.
The one shown in an Acer netbook at the Mobile World Congress was based on the slower of these two discrete chips and we do know that the new ION won't be much faster than the current version, simply as it won't have 40 shaders as originally planned. It should still be slightly faster.
Additionally, there's also a rumor over at OCWorkBench that ION2 has been renamed to ION 2010.