The Nokia Amber update will bring more than the new Glance screen and tap to unlock to the Nokia Lumia 920.
It will also bring stereo audio recording in videos to the handset, which so far has only been able to record in mono, despite having 3 HAAC microphones.
The feature is demonstrated by YouTube user hrabiamol, with a video recorded using Nokia Pro Camera, and is best appreciated with headphones.
These small little added features I think go some way to making the GDR2 update for Nokia handsets a lot more significant than the official changelog would suggest.
See the videos after the break.
Lumia 920 with AMBER audio recording test with built-in camera app (MONO)
Lumia 920 with AMBER audio recording test with NOKIA PRO CAM app (STEREO)