Quick Look previews, just like Finder: select any file and press Space, or right-click and choose Quick Look. Arrow keys step through the list while the preview is open.
Rescans start much faster: checking what changed since the last scan now runs concurrently with loading the previous results, and gives up early when a full scan would be quicker.
The status bar now says what the scan is actually doing instead of sitting on a bare “Scanning…”.
Clicking a file now selects it, so you can see what Space will preview.