Top 10 improved capabilities in Lightroom 5 - they are:
1. New Full screen preview (F key, Shift+F key)
2. More options in Loupe Overlay
| Lr 4.4 |  |
| Lr 5 |  |
3. More options in Create Smart collections
4. More Crop Overlays
...
For more see the video presentation of Lightroom guru Julieanne Kost:
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