As someone who has enjoyed his share of Flight Sims, I've always felt that a "tape" style compass with waypoint support, is the most intuitive way of getting where you need to go, while still being able to see what's going on around you. After all, there's a reason why such a navigation display is used on aircraft HUDs, and especially with flying mounts, it seems well fitted to WoW as well.
The main goal before initial release here, will be to both serve as an alternative to TomTom's waypoint arrow, as well as handling support for the "active" tracked quest on Blizzard's quest tracker (i.e. the quest that the big yellow arrow points towards).
The final goal will be to piggy-back on TomTom's waypoints, to tack on additional information to allow for ordered routes - or, like this addon's namesake, flight paths.