Right now, iTunes Plus allows you to upgrade tracks and music videos. So what about TV shows or movies? If Apple started offering High Definition versions, would you upgrade your existing library? After all, it's got to look good on your new Apple TV, right? Or do you think you're already paying a premium price for iTunes content? And you're not even getting the director's commentaries! Let us know what you think of a possible iTunes Plus Video offering in the following poll and in the comments.