Windows 8: how quickly will it be adopted?

I wonder if there's any good insight on how fast people will move to Windows 8 from Windows 7.  In my sector, cutting edge computers are key, and the latest OS is key if and only if it does stuff better than the previous.  I remember many companies skipped or activately avoided Vista because it was slow and buggy, but they jumped on Windows 7 relatively quickly.  Only laggards are still using XP or Vista and we don't care much because they also are laggard on updating our software.

What's the expectation for Win8?

 
Alan Baljeu