I’m a bit late to the party, but here is my TOH wishlist (features which are most important to me are on top, less important features are at the bottom). Your mileage may vary.
- E-Ink Display TOH:
Not only for reading e-books, but also for displaying airplane boarding passes, event tickets, and so on.
And with the privacy switch of the new Jolla Phone configured accordingly, one can show and hide these documents on-the-fly by just flicking this switch. - Additional Battery TOH:
It not only increases the device stamina, but also makes the protruding camera lenses flush with the rest of the back surface.
Bonus points, if the phone can act as a power bank through its USB port to provide energy to external devices. Even more bonus points, if the user can choose to only use this additional battery for the power bank feature (to not end up with a completely emptied phone). - Wireless Charging TOH:
Self-explanatory.
Ideally combined with the additional battery into one TOH. Bonus points, if it can also act as a source (for charging other devices wirelessly), not just as a sink. - Smartcard Reader TOH:
For those who prefer (or must use) dedicated and removable ICs for payment, authentication, digital signatures, encryption, TAN generation, key storage, and so on.
Bonus points, if it comes with its own hardware keypad and display. - LED Panel TOH:
When more light is required than the small camera flash/LED can provide, e.g. for photo or video shootings.
Bonus points, if it can be dimmed in fine steps, if the colour temperature can be precisely adjusted, or if the hue can be set in a wide range. Even more bonus points, if it comes with an additional battery built in to extend the operation time. - Environmental Sensors TOH:
Temperature, Humidity, Atmospheric pressure, UV light intensity, and so on.
Bonus points, if it additionally has a more sensitive/precise compass, accelerometer, gyroscope, etc. than what is built into the phone itself. Even more bonus points, if it also has a more sensitive GPS/Galileo/… receiver. - IR Transceiver TOH:
One remote control to rule them all. Or to transmit files the old-school way.
Must necessarily be able to both send and receive, so that patterns from the original IR remotes can be taught in. - World Radio TOH:
For receiving and playing not only FM radio, but also stations broadcasting in the short-, medium- and longwave bands.