I use the thumbnails panel mostly for navigating. I love that we can display label (I often grab the sheet number) and the scale. I would really like another feature to input the current revision and display that.
This might even be a deeper feature that would need a bigger inputs. Ultimately it would be great to have a "previous revision of this sheet" option maybe even with an auto highlight/overlay you could turn on/off but now I am dreaming too big. For those of us that just manually keep a live document it would be nice to have a 'current revision' label in the thumbnails.