I installed IBus on 11.10 and initially there was an indicator icon in the Unity panel. After a reboot, however, the indicator icon disappeared. I tried to purge and reinstall IBus to no avail. Then I whitelisted IBus and restarted Unity. That brought up an icon, but it is large and ugly and doesn't fit with my icon theme--it is definitely not the same icon I had before. How can I restore the original IBus icon?
Search for 'Keyboard Input methods' in the dash and open it. You would now end up with a IBus preference window.
There, tick the checkbox next to 'Show icon on system tray'. See the attached image for clarification.
After you enable the checkbox, you would have an IBus indicator in the top panel.