8) Updates for everyone (smaller sizes)
When apple releases a new OS they usually does not provide the update for the predecessor and stop the support for the old generation devices . So implying that this year's release would stop the OS update for iphone 4s, ipad mini 2, ipad 2 and ipod 5 and it would be the end of the road for all these devices. But this year they decided to provide updates for the older models with IOS 9 which means iphone 4s, ipad mini 2, ipad 2 and ipod 5 will get the update.