A presentation slide leaked, containing new improvements will be available for Nokia Lumia devices with Amber update. Low to mid end Lumia smartphones such as Lumia 520, 720, and 820 will get Bluetooth 4.0 support.
Bluetooth 4.0 driver for Qualcomm Snapdragon MSM8227 chip inside those services have been developed by Microsoft and Nokia. It will make those mentioned Lumia devices can be paired with low power accessories like Fibrit and smartwatches. Amber update will be rolled out starting in August 2013.
New features will be brought by Amber update include:
Color Management: ability to adjust color saturation
Date Sense: Data traffic monitor
Double-tap to wake: double tap to wake up the device like the one on Nokia N9
Flip to Silent: flip the phone to stop ringtone
FM Radio: All devices will get this feature except Nokia Lumia 620
Nokia Smart Cam app
Sleeping Screen: latest screensaver
and other features