Apple has emailed developers that their iTunes Match libraries will be deleted on Saturday, November 12th presumably for the last time until iTunes Match is officially launched.

As we prepare for the launch of iTunes Match, we will be deleting all current iCloud libraries on Saturday, November 12th at 10 AM PST.

Please turn off iTunes Match on all of your computers and iOS devices. On your computer, choose Store > Turn off iTunes Match. On your iOS device, tap Settings > Music, then turn off iTunes Match. On your Apple TV, please choose Music > Turn off iTunes Match.

The songs on your computer should not be affected. As always, please backup regularly and do not delete the music you add to iCloud from your computer.

iTunes Match was supposed to launch at the end of October but Apple has likely encountered some bugs that resulted in pushing back the release date. There has been an inactive toggle in iOS 5 since shortly after its launch.

iTunes Match will allow customers to pay $25 a year to have their music libraries matched with the content available on iTunes at 256 kbps bit rate quality. For songs that aren’t available on iTunes or unrecognizable by the service, the user can upload the content manually. The songs will then be available on all Apple platforms (OS X, iOS, Apple TV) and iTunes as an option to download the content straight to that device to listen to.