IBus for mainland standard Chinese and Japanese work pretty well. For Cantonese and other Chinese input method types it might not be as good as other input frameworks.
The upside if Gnome would add Ibus for 3.6 is that you would not have to add and configure a lot of extra software in order to input CJK.
In Fedora 17, there is one keyboard configuration tool and one Ibus configuration tool. It is way easier just to have one.