Wired links to doors and windows for wired contacts/sensors. The cheap wireless burgler alarms can easily be jammed. Also wires for automatic shutters (if you have shutters).
Metereological sensors (wind/rain/temperature) for e.g. retracting an awning if it rains or the wind gets to strong. Can also be used for control the heating/AC.
Network sockets (or at least tubes to run them through) basically everywhere. Have you thought of having an outlet where the big mirror in the corridor/entrance area is, so you can one day turn set up a magic mirror there?
Have you thought or wiring up motion sensors throughout the house to automate lighting (and get additional input for the burgler alarm)?
Wired links for any kind of camera is vital, be it the door cam, or anything watching the place for security reasons.
Wired smoke alarms! Not only will they be connected, so they all start beeping when smoke or fire is detected, but you don't have to change batteries every other year, and you can integrate the output inot he home automation system and get a mail or SMS is case of an emergency-
What kind of smart appliances could you imagine? Smart fridge, smart washing machine? Even if there is a non-smart device, you can rig a raspberry pi or even an arduino to detect the beeping of your dryer and send you an email.
Well, and more network sockets...
Do you have some outdoors (patio, garden)? Does it have wifi coverage?