There haven't been a huge amount of Android concept videos, especially considering how many iOS concept videos we see (although the number is certainly higher than the number of Windows Phone concept videos around). But, designer Craig Tuttle has decided to put together a concept video with a couple very good ideas for changes that we may see in Android 5.0...
Source: http://www.phonearena.com/news/Android-5.0-concept-video-has-some-good-ideas_id47598
Source: http://www.phonearena.com/news/Android-5.0-concept-video-has-some-good-ideas_id47598