Yesterday I did a full system update (the old one dates back less than a month) and now all my global keybindings don't work anymore. They are created via "gconf-editor" and are located in /apps/metacity/keybindings_commands and global_keybindings. I noticed that there are now only my user generated ones whereas before global_keybindings and keybinding_commands was full of placeholders like run_command_1, run_command_2,....
A search for run_command (include key names) only finds my user defined ones as well so it doesn't seem like they have moved.
A google search for "gnome 3 keybindings moved" didn't find anything with search restriction to the last month.
I updated with "sudo pacman -Su" (I am using Arch Linux).