For third person games like how, I assume, most people play MMOs, I don't think it'd be too game changing. I think its more designed for first-person shooter type of games (with the current way games are designed). Maybe in the future, when it gets mainstreamed into every gamers home, RPG games will be designed with a first person point of view in mind so people can actually benefit from a more heads-up-display type of interface.

It is awfully exciting though, I look forward to trying out some of the games it is compatible with.