Surprise us all
Come on Apple, come up with something pervasive - like a small headset that can be a voice-op phone, or activate voice control on a nearby computer, or pick up timetables from intelligent bus stops, or buzz gently when someone we know is nearby.
How about family photo sharing - all pictures taken by all family members available to all with location and timestamps?
What about a many-sim iphone? or paired iphones, where one number rings more than one phone, like a 1930s plan 1 extension system?
Parked bluetooth (or better wireless method) headsets that charge from the ipad while parked inside it?
Remember 'beaming' your business card from one palm pilot to another. What about tap-to-share-contact-details?
An Identifcation system other than passwords? something like PKI cards, but as a tiny rfid thing in jewellry or watches or phones or badges or spectacles? I would buy a terminal/programming adaptor/app for home, and blank rfid dust. I would then programme/refresh the individual rfid items to identify me for a day, week, month - after which they would die and need replacing. And the terminal could cancel them on request, perhaps by telephoning it. Maybe I would have to be carrying at least 4 to complete succesful ID, so that any one lost/stolen item could not impersonate me. The vendor could sell the terminal; charge a subscription for identifying me; and sell the rfid dust too. Up-front and continuing revenue. Perfect.
Health monitoring and telemetry.
Panic communities: phones with a panic button, and volunteer responders as well as national ones. (see our community defibrilators in vilages in Lincolnshire for how people are keen to help each other)
How about a version of an LCD photo frame with a sim in it? So that I can take pictures of the kids and send them by MMS to their grandma without her having to to do anything?
How about a 'family status' mirror, for the hallway? Nice big mirror, little individual cells showing where we are, the last message we sent, lat photo we took, happy/busy/bored/need a hug icons? Touch two of them and the mirror duplicates each other's status to each other - "Mum said you need to talk to me" sort of thing.
A bigger, better Siri that can be your friend, learn about you, start to suggest things spontaneously?
Things for the disabled? Pick up the state of pedestrian controlled lights for blind people - "West street, crossing outside No. 8, from North to South pavement, Stop. Go in 15 seconds. 14, 13...". "Cooker turned on but not lit". "Saucepan has been boiling for 8 minutes"