What would you want in a 5.0? I feel the OS has been updated a lot in the last year or two but mostly by app updates as Google is now moving a lot of their sto

What would you want in a 5.0? I feel the OS has been updated a lot in the last year or two but mostly by app updates as Google is now moving a lot of their stock Android apps to the play store. Much sought after features like a tighter Hangouts/Voice/Sms integration would 'only' need an app upgrade as opposed to a new OS.