I will wait!
I will wait for GDR3 since I can live without a Rotation lock and Custom Sounds.
The thing which would have made me go crazy for updating would have been custom volume profiles and ability to set some background textures for WP8 start screen.
I am fine with GDR2 and I will wait for Nokia to officially release Bittersweet Shimmer for my phone. How many are still waiting for the update & are thinking like me?