I'm not sure if this only works for my computer or not, but I suspect it works for this specific video. I tried other videos and they have the normal white bar version of the YouTube player so I know it's not just some recent update that happened for all the videos on YouTube. This video's different because it has a version of the player that I haven't seen before. Could it be a secret 
NEW player that YouTube is working on? 

 The link is *hopefully* down below...
Video: 
http://www.youtube.com/watch%3Fv%3DeG2_kpSYx  XI
The latest comment is from like 1 month ago so nobody's commented on it and Google seems to come up empty so I thought I'd try here 
Who knows, this might be just an option that YouTube gives posters and everyone except this guy might just prefer white... O_o
Thoughts?
P.S. If the video is changed or anything, here are screenshots of what I saw (raw images sans editing)
With mouse off video: 
With play/pause bar up: 
