I really like the "selected" filter as a nice and simple version of culling mode. One thing struck me though: When I enable the "selected" filter, I enter a new level of collection. In the screenshots below there are 10 images selected, once I activate the "selected" filter, it only displays those 10 images (as expected), but it also reads "0 images of 17 images in current collection selected".
I would have expected that the selection stays the same, which would in turn make it possible to cull images by simple deselecting them. In other words: I select all candidates, enter selected filter, deselect until I have reduced down to "keepers", then apply star rating/color label/tag to the remaining and still selected images.
Nice touch on the automatically adjusting zoom level in the selected filter.