The Amber update is a Nokia exclusive update on top of the GDR2 software release from Microsoft for the Lumia range of Nokia phones.
The update has the following extra features:
- Glance screen to check notifications, time and battery (not on 520 or 625)
- Flip to silence
- FM radio (not on 620)
- Storage check tool
- Data Sense (network dependent)
- Double tap to wake the screen
- Nokia smart camera
- Updates to HERE suite of apps – now just download the updates to maps rather than the whole map again
- Access to extra apps like Video Trimmer and Video Uploader
- More camera settings
Here is a nice little video guide from Nokia showing how easy it is to update your software.
You can check to see if your model has the update available by checking the Nokia website on the source link. At the time of writing it is just the Vodafone 920 that has it available with the 820 coming soon.