Smart Collection of images that need MetaData upating

[Josh-H]

In where the @#$%^&# are my images Seth talks very briefly about a smart collection of images that require meta data updating.

Since I rarely remember to save out my metadata when I finish working on an image I thought this a cool idea - but couldnt see where it can be implemented - was this a wish feature? (If so.. Adobe - please add, its a great idea).