It's a GPS tracking app for skiers (with running and biking skinned versions to come later). Sadly it's still in review with Microsoft, I was hoping it would get released by Christmas. Here are links to the Android and iOS versions:

Ski Tracker+ for Android - https://play.google.com/store/apps/details?id=com.thirtySout...

For iPhone - https://itunes.apple.com/us/app/ski-tracker-gps-tracking-for...

All iPhone - https://itunes.apple.com/us/artist/30-south-llc/id331245760

All Android - https://play.google.com/store/apps/developer?id=30+South

Update, Windows app released - http://www.windowsphone.com/en-us/store/app/ski-tracker/4b7b...