The upcoming IOS 9 has better multitasking features and more intelligence. It is designed to improve performance, battery life, security, user experience and Siri.
For Siri, she will learn more about your intentions over time but that may still look inaccurate unless you have planned out your schedules. A great improvement is that when an unidentified number pops up on your phone, it will try to track down the device to identify what it is to indicate whether it's the same user using it or not.
For security improvements, your emails, photos or other data won't be scanned for information mining and that you can get in control of the data and privacy with the deeper Siri and search integration.
Other improvements involve the Apple Pay, Apple Map, the on-screen keyboard that has the copy and paste feature as well as the split view feature that is similar to the one in Windows 8. However, not all multitasking features are available in various IOS devices. The last improvement is the Low-Power mode that improves the battery life that will last few more hours.
And if you want to try out, the preview version will be out in July and the download size is much smaller than the one in IOS 8 in which people had some trouble about the storage size after upgrading to IOS 8 or buying the device that has IOS 8 pre-installed. 4.6GB for IOS 8 is already way too much and it may be akin to downloading a 4GB ISO image of Mac OSX that the amount of hard disk space required is like more than 4GB. And if you have an IOS device that has 8GB of storage capacity, perhaps, the IOS 9 upgrade should be less of a problem provided that your device is able to upgrade to that as IOS 9 takes up 1.3GB for OS upgrade. The final version will be out sometime in Fall this year but we may want to make sure that they should not screw it up.
