I'm hoping Apple brings a few new features that would round out the OS and make it easier to use and more efficient for users.
Access to playlists from the lock screen - I listed this in my What I want in iOS 7 thread last year. It never happened and now the JB community shows what it would be like.
Pluck 2 - pick songs and play directly from Lock screen
Up Next feature in music app - Like in iTunes I want the Up Next feature where I can setup the list of songs I want to play. Playlists are huge now and with Shuffle there are still times you listen to a song and then you want a specific song to play next. In combination with the above feature this would save the time of unlocking the device launching the music app and performing the steps. The less time the screen is on the better it is for battery life. So it may only save 1-2 seconds at a time but it is more convenient and that time will add up.
Unlock my Mac with Touch ID - This Jailbreak tweak
Upcoming tweak lets you unlock your Mac using Touch ID shows how cool it would be. It might seem gimmicky but don't be fooled this could be one of those things causing an iPhone user to want to switch to a Mac.
iMessage reply from the lock screen - Jailbreak users have had this functionality for a long, long time with BiteSMS. Now Apple has tidied up the whole system. The notifications now sync between iOS and Mac devices to prevent the user from checking the same message multiply times. Now on the Mac you can answer the messages without launching the app. My fear though is that even though Apple may do something in iOS 8 it wont be close to what BiteSMS does. In other words I don't think right now they will allow users to answer messages from the lock screen. It is still a security issue. They may allow answering messages from within an app without leaving the app or launching iMessage. However I don't see lock screen happening for now.
Ability to put app icons/folders anywhere on the home screen grid - Again I wanted this for iOS 7. I don't want the ability to put the icons/folders anywhere they will still be on the grid. I just want to be able to put them anywhere on the grid that I choose. They would snap to different points but I would be able to put them around the edge of the screen or in a "+" pattern if I choose. They probably will never do this on the iPhone because it will be too complicated for some users.
Attachment button in Mail - The methods they have are still not intuitive. Everyone has been taught to look for the paper clip why can't they just follow the standard and make it better?
Better Siri - Siri has been getting progressively better. However there are still things that are frustrating and some that don't seem normal. When you activate Siri for example whatever you were listening to gets paused. But when you're done with Siri it doesn't unpause. So you're left for a few seconds to a few minutes until you realize and unpause your music, podcast, etc. If Siri would recognize what is playing and then when it closes un-pause it that would seem natural and seemless. There are some basic things that Siri can't do without an internet connection it's frustrating. Siri also can't turn on the data connection if it's off without requiring the passcode. If I'm able to take my iPhone out of my pocket to enter the passcode why would I bother using Siri to turn the data connection on/off it's just a few taps away. It seems a little silly especially since you can't use Siri without the internet but Siri wont turn the internet on lol.