I understand that the documentation doesn't indicate support for Windows 8. But I'll ask anyway. Is the Beta team willing to field any questions related to Icenium installed on Win 8?
Feel free to post any issues you have. We have tested Icenium Graphite in Windows 8 release preview and it seems to work after you have agreed to run unsigned applications. Once Windows 8 is out we will make sure Graphite is fast and fluid and works smoothly.