There is no importing in ON1 Photo 10. You will not need to wait for the images to be imported or added to your catalog like Adobe Lightroom or Apple Aperture. Simply copy the file to your HD. Once you have copied the files to your HD you will be able to open the images in the Suite. Please watch this video to learn more.
ON1 Photo 10 will support PSD, DNG, JPG, TIFF, and RAW files. Go here to view the full list of compatible RAW files.