Make a list, then when the Windows 8 RTM is out report any issues which still exist.
Reporting things now will just mean the issues are forgotten, and we are not going to start tracking issues against a completely unfinished OS version.
We won't be spending time on the Windows 8 preview releases when Microsoft have made clear that they are still completely unfinished, with major changes still being made even after the recent "Release Preview".
Things like the new desktop theme, which Microsoft are going to change at the last minute and which isn't in any preview release, will mean that Opus will need to be completely re-tested, so we are not going to waste time testing against the preview releases now (beyond some quick testing to get an idea of what to expect; but who knows what will change by the time of the final release, with the way the project is being managed this time around; it's turning out a lot less predictable and stable than previous Windows development/beta cycles).
Ok, will report after release (~2 months). I am now on 8 because I bought a windows-tablet and want to test the touch-features (and new settings)!
For others to know: For me Win8 works like 7 w/o problems, just the X-Fi-soundcards needs the PAX-drivers and NVidia-GFX-user should install latest v3xx because of "pink screen of death" .