The wrist shouldn't be the target. The best wearable should emphasize the screen. A watch does't have the pixel real-estate.

Google glass deprecates information to a single 640 x 360 image. At the other extreme Occulus Rift blocks out the real world completely. At least it is 3D and has better resolution.

What I have in mind for Apple is narrow reading glasses using two 4K displays. 4K 3D is skating to where the puck is going to be. It is worn low, occupying the lower third of the field of view equivalent to a car dashboard.

Utilize a normal size belt to house the battery to which is clipped a tiny box containing Intel CPU, ARM CPU, Flash memory. The buckle is a trackpad allowing both OS X and iOS. iOS can be operated without need for direct touch by having up to five translucent circular "cursors" to pre-position the gesture which is not invoked until you press down on the trackpad switch during the actual gesture.

iOS occupies and preempts the area formerly known as "Widgets". MacBook Pros seamlessly switch the GPU in an out according to need. Go to the "Widget" area and the intel CPU drops out to save power and run existing iOS software natively on a $15 ARM CPU.

In OS X mode, infrared lasers track eye movement and the usual OS X cursor is slaved to your eye movement. Long blink of left eye to left-click, long blink of right eye is right-click, long blink both eyes to drag and drop. Thus true hands-free mode supplements the belt-buckle-track pad.

This "iDash" has the potential to obsolete the phone, tablet, laptop, desktop and even the home theater with each member of a group simultaneously streaming the same material while seeing each other over the top of the glasses in a fully illuminated room.

When one screen serves the phone, tablet, laptop, desktop, home theater function, redundant CPU(s), GPU, RAM, Flash and sensors are eliminated making for considerable cost saving to the consumer who then doesn't need multiple devices.

Only Apple have exhibited the courage to obsolete itself and boy would this obsolete all these different platforms.

Ask yourself: Could there be a better camera viewfinder? The lens must share an enclosure with the sensor. The viewfinder doesn't belong on the box, but rather on the photographer. This is the end of washed-out viewfinders with the camera placed where the photographer can't easily go. The two cameras clip to the glasses but are not built in, thus avoiding the flaps Google Glass has generated. Furthermore the cameras would often be used in a remote location like on the end of a pole or on a drone.

The earbuds are made ambient friendly through the simple expedient of two slider volume controls. One for device gain, the other to deliberately mix in the ambient sound of the room in desired proportion. I don't know how the audio industry missed the simplicity of this. It would leverage the ambient microphones now used to cancel ambient sound through phase reversal. Bring up the ambient slider and the phase un-reverses. Earbuds using this would also be able to record a true binaural 360 sound as earbuds are positioned in the ear duplicating subtleties which give perception of a rear source. An added bonus: great for the hearing impaired.

Apple are uniquely positioned as the stores could house audio and optical technicians to custom taylor eye prescriptions and corrected hearing response curves. This could be the best sound and best screen anyone has ever seen or heard.

It anyone can make this rig look good, it's Jonny Ive.