I'd like to see a taptic navigation ap for individual ski areas. "Navigate to chair x via blue." "Navigate to base lodge via black." "Navigate x run to same chair." "Navigate gladed run to car." "Navigate to x restaurant." Bonus for being able to navigate to huts. The ap should know if a user is on a lift so it would choose options knowing you want it to navigate from the top, not the current position. It could then give the user several options, then allow a choice, either verbally, or on the fly, giving one signal for a mandatory turn, another for an optional turn, and a warning when it's the last option. Potentially ski area or social media updates to alert of new terrain open. There's ski aps that run on the iPhone to track runs, vertical feet, average and high speed. Display of data from these aps would be nice.
All the requests could be done on the lift when many people don't want to pull out their phone for fear of dropping. Gloved or cold hands are lousy at handling phones or ski area maps. It would allow a person to efficiently navigate a ski area they have never attended before, without standing on a run consulting a map.
The iPhone component could also display an interactive area map. "Highlight south facing slopes." Highlight bowls." "Highlight double blacks." The iPhone could also provide restaurant ratings and apres ski specials.
Personally, the taptic response is one of my main reason for wanting the watch. Being able to navigate without staring at a phone would be very beneficial. When I'm carrying a bunch of stuff, phone use requires me to stop, look at the phone, and try to remember the way. Turn by turn navigation walking, riding a bike or driving would be more convenient, quicker and safer as well.
A more popular ap, but not as important to me would be airport navigation. Some airports have good signage, others do not. It would be especially useful abroad when signs are in another language. "Navigate to gate 62." "Navigate to car rental." "Navigate to bus servicing parking lot x." "Navigate to flight x." This would be especially useful for finding connecting flights when time is limited. Everyone's hands are full at the airport so many would appreciate taptic navigation.