The iPhone 4S took a bow last week but we also learned the iOS 5 release date is 12 October. That's tomorrow!

iOS 5 was originally revealed during the WWDC 2011 keynote back in June and we saw a full run down of it during the iPhone 4S keynote speech.

Read on for our list of all the new iOS 5 features, but for a video rundown of what's new, check out T3's iOS 5 video below:

iOS 5 release date

iOS 5 is released tomorrow - it'll be available for download via iTunes 10.5, which is also new.

iOS 5 compatibility

iOS 5 will work with iPhone 4 and 3GS (the latter is a surprise), iPad and iPad 2 as well as the iPod touch 3rd and 4th gen. We're also a little surprised to see it's going to be rolled out to the original iPad, but as it has the same hardware as the iPhone 4 we guess Apple doesn't have to cut it loose this time.

iOS 5 goes PC-free

Apple says it is "cutting the cable" with iOS 5 - just as well, since it claimed the iPad 2 was the first post-PC device earlier in the year. This means OS updates can be delivered over the air - you'll just receive what's changed rather than the usual 600MB download - and devices can be activated without plugging them into a computer with iTunes. Ace.

You can also now create and delete iOS calendars and mailboxes, so you really can devolve your device from your PC or Mac.

"You can activate on the device and you're ready to go," explained Apple's Scott Forstall.

"Software updates are now over the air. So you no longer need to plug in to update your software. And they're now Delta updates. Instead of downloading the whole OS, you only download what's changed," he continued.

"We said, why do people go back to a computer? Calendars, people create or delete them. You can do that now. Photo editing, you can do it on the devices. Even mail - you can create folders.

"So if you want to cut the cord, you can."

With iOS 5 and iCloud, you just enter your Apple ID and password, and iCloud will seamlessly integrate with your apps to automatically and wirelessly keep all of your mail, contacts, calendars, photos, apps, books, music and more up-to-date across all your devices, without ever having to connect to a computer.

iOS 5 Siri?

Sadly iOS 5 won't bring Siri voice control to the iPhone 4 and 3GS - this is a feature exclusive to the new iPhone 4S.