As suspected few days ago, ahead of the release of iOS 5, Apple on Tuesday released iTunes 10.5 for Mac and for PC, supporting the wireless syncing that iOS 5 will introduce tomorrow, as well as the new iTunes Match service.

If you are intending to upgrade your iOS device tomorrow, then you’ll require this last version of iTunes which is available from this link.

This is the full list of the new and upgraded features:

iTunes in the Cloud. iTunes now stores your music and TV purchases in iCloud and makes them available on your devices anywhere, any time, at no additional cost.
Automatic Downloads. Purchase music from any device or computer and automatically download a copy to your PC and iOS devices.
Download Previous Purchases. Download your past music, TV, app, and book purchases again, at no additional cost. Previous purchases may be unavailable if they are no longer on the iTunes Store.
Sync with your iPhone, iPad, or iPod touch with iOS 5.
Wi-Fi Syncing. Automatically sync your iPhone, iPad, or iPod touch with iTunes any time they’re both on the same Wi-Fi network.

Apple is also expected to release the new OS X Lion 10.7.2 within the course of the day/night.