As much as I want to believe that was Michael's ghost (the thought is very comforting), I have to be realistic. On Thursday during the taping of Larry King, there were ALOT of people roaming around that ranch including other journalists, workers, etc. Plus at the end of that hallway where the figure was seen...there was a window just to the left. This makes me believe that it is most likely a shadow from someone passing by the window outside.
I do however believe in ghosts, and I hope Michael's spirit gets caught on tape one day. There are already reports from various parts of the world where sick and dying people have been visited by Michael and have been miraculously cured the next day. No joke, you can read the stories for yourself. Whether these are true I dont know, but the thought is nice.