The YouTube template got an overhaul. The page is now stretched wider, with the former top tabs being more like a single-element navigation bar, the search box is now displayed before playing a video in an embedded player. There's a parameter that can be added to your embedded videos if you don't want to display the search box: edit the code and add &showsearch=0 after http://www.youtube.com/v/VIDEOID&hl=en&fs=1.
YouTube header, now has a new overlay that shows the duration of a video over the thumbnail. YouTube's blog says that the thumbnails will no longer be selected from the 25/50/75 points of the video's index, but they'll be selected algorithmically to minimize the impact of manipulative thumbnails.
Another change, “Videos that are considered sexually suggestive, or that contain profanity, will be algorithmically demoted on our 'Most Viewed,' 'Top Favorited,' and other browse pages.
"Videos featuring sexually explicit content like real sex acts are not allowed. Other content like nudity and dramatized or implied sexual conduct may be considered sexually suggestive depending on whether or not it is intended or designed to arouse viewers," explains a help page.
From now on, videos that include suggestive content will be filtered from the lists of popular videos and they'll be age-restricted, so you'll have to confirm your age before viewing them.
Source:→ Google System