We’re ready to touch the future! Today, iPhone and iPod Touch users can upgrade to iOS4 and touch the most advanced mobile operating system ever made! Want to know when to expect it and what you need to do before you update? Buzz is that the free iOS4 update will be posted to iTunes at around 1pm Eastern/10am Pacific. For iPod touch users, remember that this update marks the first time a major OS upgrade has been available for FREE for your device. AppAdvice will be monitoring throughout the day to see when it becomes available and will update our site when it happens. What is iOS4? You can read this article for to know further.