Some of the upcoming features of Windows Phone 8 GDR2 were revealed by Microsoft, in addition to Nokia’s Amber firmware update.
Portico
Windows Phone 8: What Would Make It More Awesome?
Some additions/enhancements to Windows Phone 8 to make it even more useful and appealing.
Windows Phone 8: Platform/OS Issues
Windows Phone needs a lot of fixes. This post goes into some key issues with the platform/OS that need to be addressed quickly.
Romit's Stream 