I clicked 'Me Too' when SNAKE58 posted his initial question, as my concerns were the same. I have been using windows since Win 3.1 through all versions till now. This has been the simplest upgrade of all, as long as you complete the prep first. Before
upgrading to Win8 Pro from Win7 Home Premium I performed all the prep tasks to ensure smooth changeover, (still fingers crossed though) I.e. clearing all the rubbish files, defraging the drive, getting all the updates required for software hardware/drivers,
performing a disc backup and syncing my iPhone and iPod, disconnecting all devices, then by following tha advice from the Win8 upgrade assistant, one of which was to De-authorise the PC from the Apple store using iTunes ver 10.7. (as you are only allowed up
to 5 authorised PC's). During the upgrade I had chosen to transfer all Apps/files settings. The upgrade took 1 hour 10 mins and I am still able to use other software made for Win95, so iTunes 10.7 does not pose any problem of compatability with Win8 Pro, all
I needed to do was re-authorise my PC again using iTunes, by clicking the iTunes tile in the Metro Start screen. All my applications have their own tile in the Metro screen and it very simple to switch back to desktop screen which, is as I left it, in Win7,
except the Start menu is now the Metro app. Whilst typing this, I have synced my iPod again (48Gb of music/video/files), all okay. Now have the iPhone 3Gs connected and iTunes has offered to download and install new iOS ver 6.0.1. Install done and iPhone 3Gs
synced again, all okay. (I use all genius mixes on iPhone). So iTunes 10.7 is compatible with Win8 Pro. Win8 Pro is a winner at this time.