Apple has now released iOS7. To get the download, you will need to have Wi-Fi access and assume a download of around 700 mb for an iPhone and about 900 mb for an iPad.
To get the download, tap on Settings > General then tap on Software update. You will be prompted to agree to terms and conditions. It is suggested you plug in your iOS device to a power source.
Also, iTunes 11.1 has been released.