Well, since all Android manufacturers can do is to copy Apple... you bet, there is already Samsung with its 4" galaxy mini.
http://appleinsider.com/articles/13/03/23/googles-android-powered-by-remarkable-new-flawgic
http://appleinsider.com/articles/13/03/23/googles-android-powered-by-remarkable-new-flawgic
I wish Android offered top tier phones in a smaller size. You only have one choice category - big.