It seems that YouTube is either doing A/B testing or that the changes haven’t propagated to all servers (if that’s even possible) - hard refreshing on videos seems to alternate between the standard video player and the widescreen one. But it’s a widespread change, as hundreds of tweets are pouring in in about the switch to widescreen.
Widescreen YouTube videos have been spotted before now and could be enabled using a tag in the video’s URL, but this seems to be the first time that the feature is activated by default. The change may be related to YouTube’s recent announcement of full-length films from MGM, which pits it directly against Hulu.


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